When Verbs Become Instructions: Tan Mu's Protocol Lexicon and the Grammar of Machine Commerce

On January 11, 2026, a consortium of companies including Shopify, Walmart, Target, and others announced the Universal Commerce Protocol, a standardized language designed to allow artificial intelligence agents to complete the full cycle of commercial exchange, from product discovery through checkout and customer support, without bespoke integrations between platforms. The protocol defines verbs, discover, offer, checkout, fulfill, return, and nouns, cart, credential, merchant, agent, and the grammar that connects them, a set of rules governing how an agent negotiates with a merchant's system, verifies a buyer's credentials, processes a payment, and tracks a shipment. The verbs are not descriptions. They are instructions. When an AI agent reads the verb "checkout," it does not understand the word. It executes a procedure, a sequence of system calls that places an order, charges a payment method, and confirms delivery. The verb has become executable. Language has become action. This transformation, from description to execution, from meaning to mechanism, from the human act of speaking to the machine act of doing, is the subject of Tan Mu's Protocol Lexicon, a series of 115 paintings on linen, each one paired with a .art internet domain that is transferred to the collector upon acquisition, a work that spans the full catalog of 2026 and that treats the protocol not as a technical specification but as a vocabulary, a set of words and rules that, like every vocabulary before it, determines what can be said, what can be done, and who gets to decide.

The first painting in the series, Protocol Lexicon 01 (2026), oil and acrylic on linen, 30 by 40 centimeters, is small. It is the size of a tablet screen or a notebook page, a canvas that the viewer can hold at arm's length and examine with the same sustained attention that a reader would bring to a page of text. The painting depicts a field of symbols, notations, and diagrammatic structures that reference the protocol's architecture, the transaction states, data pathways, trust verification markers, and settlement rails that govern how an agent's request moves from the buyer's device through the merchant's system to the payment processor and back. The symbols are not literal transcriptions of code. They are Tan Mu's interpretation of what a protocol lexicon might contain if it were drawn rather than written, visual primitives that isolate the functions of discovery, offer, checkout, fulfillment, and return into discrete visual units that the viewer can read as a map of the protocol's structure. The palette is layered, the paint applied in successive passes of acrylic and oil that create a depth of surface, the earlier layers partially visible through the later ones, each layer adding a stratum of visual information that corresponds to a layer of the protocol's architecture, the application layer visible through the transport layer, the transport layer visible through the network layer, the entire stack compressed into a single painted surface.

The material technique that produces the series' layered surfaces is the application of acrylic as a base layer and oil as a top layer, a combination that creates a surface in which the earlier, faster drying acrylic is partially visible through the later, slower drying oil, the two media coexisting on the same canvas without fully merging. This layering is the material equivalent of the protocol's architecture, in which each layer of the stack, the application layer, the transport layer, the network layer, the physical layer, is built on top of the layers beneath it, each layer providing services to the layer above and consuming services from the layer below, the entire stack operating as a unified system even though its components are designed and maintained by different organizations, different teams, different individuals. The painting registers this stacking in its surface, the acrylic visible as a ghost beneath the oil, the earlier layer contributing a depth and a complexity to the surface that the oil layer alone would not possess. The viewer who looks closely at the painting sees, in the transparency of the oil and the opacity of the acrylic beneath it, the protocol's own structure, the layering of services that makes machine commerce possible.

Gerhard Richter has been assembling a work called Atlas since 1962. Atlas is not a painting. It is a collection of photographs, newspaper clippings, sketches, color studies, and found images that Richter has gathered over six decades, mounted on panels, and exhibited as a single, sprawling installation that currently comprises over 800 panels and tens of thousands of individual images. The collection is not organized according to any conventional taxonomy. It is not sorted by date, by subject, by medium, or by source. It is organized, to the extent that it is organized at all, by association, by the connections that Richter's mind has made between images that share a visual similarity, an emotional resonance, or a conceptual affinity, connections that are personal, idiosyncratic, and deliberately resistant to the systematic classification that a museum or an archive would impose. Atlas is, at its core, a work about the accumulation of visual information, the process by which a painter builds, over a lifetime, a reservoir of images that informs and is informed by the paintings he makes from them.

The connection between Richter's Atlas and Tan Mu's Protocol Lexicon is structural. Both are large scale accumulations of visual material that resist reduction to a single image or a single meaning. Richter's Atlas contains 800 panels. Tan Mu's Protocol Lexicon contains 115 paintings. Both are ongoing, Atlas since 1962, Protocol Lexicon since 2026, and both are designed to grow, to add new panels and new paintings as new material becomes available, as new photographs are taken or new protocols are announced. Both treat the act of accumulation as an act of attention, the sustained, patient gathering of visual material that the artist encounters in the course of daily life and that the artist preserves, in the case of Richter by mounting photographs on panels, in the case of Tan Mu by painting protocol structures on linen, as a record of the moment in which the material was encountered, a timestamp that registers the historical specificity of the source, the newspaper clipping from a particular date, the protocol specification from a particular month, the image that existed in the world at a particular time and that the artist, through the act of collecting or painting, removed from the flow of time and placed in the archive.

Richter's Atlas is a work about the relationship between the photograph and the painting, the source image and the finished canvas, the raw material and the refined product. Every photograph in the Atlas is a potential painting, a source from which a canvas could be derived, and every painting that Richter makes is a transformation of a source, a conversion of the photograph's mechanical precision into the painting's handmade interpretation. The Atlas makes this relationship visible, the photographs mounted on panels beside the color studies and sketches that prepared the way for the paintings, the viewer able to trace the path from source to finished work, from the newspaper clipping to the canvas, from the snapshot to the oil painting. Tan Mu's Protocol Lexicon makes an analogous relationship visible, the protocol specification mounted, in the viewer's imagination, beside the painting that interprets it, the viewer able to trace the path from the technical document to the painted surface, from the UCP specification to the visual primitives that Tan Mu has derived from it, from the machine language to the human language, from the executable verb to the painted symbol.

The UCP's definition of commerce verbs, discover, offer, checkout, fulfill, return, is the protocol's most significant conceptual innovation. These verbs are not descriptions of commercial activities. They are instructions that AI agents execute, system calls that trigger specific procedures within the merchant's platform. When an agent reads "discover," it initiates a search. When it reads "offer," it retrieves a product listing. When it reads "checkout," it places an order. The verb has been detached from its human meaning, the dictionary definition of "discover" as "to find or learn something for the first time," and attached to a machine meaning, the protocol definition of "discover" as "to initiate a search query against a merchant's product catalog." This detachment is the fundamental transformation that the protocol enacts, the conversion of language from a medium of human communication into a medium of machine execution, the replacement of the human act of speaking with the machine act of doing.

The protocol's nouns are equally significant. Cart, credential, merchant, agent, each one a container for a specific type of data that the system processes in a specific way. The cart holds the items the agent has selected. The credential holds the buyer's identity and payment information. The merchant holds the seller's catalog and fulfillment capabilities. The agent holds the buyer's preferences, history, and authorization to act on their behalf. These nouns are not abstract categories. They are data structures, containers of specific fields and values that the system reads, writes, and transmits as it executes the verbs. Together, the verbs and nouns form a grammar, a set of rules that determines which actions can be performed on which objects, which combinations of verb and noun are valid and which are not, which transactions the system will process and which it will reject. This grammar is the protocol's deepest structural property, the rule set that governs the behavior of every agent, every merchant, and every transaction that the system processes.

Tan Mu has described this transformation in terms that connect it to her broader investigation into the relationship between language and infrastructure. "Language implies grammar, syntax, shared symbols," she has said. "Protocol implies structure, consensus, rules of engagement. What I recognized was that this was not simply infrastructure. It was vocabulary. Whoever shapes the vocabulary of a system shapes what becomes speakable within it." The observation is precise. The UCP's verbs define what an AI agent can do. The UCP's nouns define what an AI agent can act upon. The grammar that connects them defines the relationships between actions and objects, the rules that determine which verbs can be applied to which nouns, which transactions are valid and which are not, which requests will be fulfilled and which will be rejected. This grammar is not neutral. It is a political structure, a set of rules that determines who can participate in the system and on what terms, who can sell and who can buy, who can discover and who can be discovered, who can fulfill and who must wait.

Yiren Shen, interviewing Tan Mu for 10 Magazine in 2025, elicited a statement that makes the philosophical stakes of Protocol Lexicon explicit. "If Earth is our motherboard, then submarine cables are the logic circuits linking global supercities. Through them, human knowledge and emotions flow, driving innovation." The motherboard metaphor, originally articulated in the context of the Signal series, extends to the Protocol Lexicon with a precision that Shen may not have anticipated. The cables are the physical layer, the copper and glass fiber that transmit data across oceans. The protocol is the logical layer, the grammar that determines how data is interpreted, how it is acted upon, how it becomes a transaction. The two layers are complementary, the physical layer providing the channel and the logical layer providing the meaning, the cable carrying the signal and the protocol telling the signal what to do. Tan Mu's two series, Signal and Protocol Lexicon, paint both layers, the material infrastructure and the linguistic grammar, the heavy cables on the ocean floor and the lightweight rules that govern what travels through them.

Tan Mu has situated Protocol Lexicon within a historical lineage that spans the entire history of executable language. In her own account, the series incorporates references to Ada Lovelace's Note G, the first algorithm for a computing machine, to the punched cards that first translated human intention into a form machines could read, to the DEC PDP 10 that carried early visions of shared computing, to Deep Blue that marked the moment machines surpassed humans within rule based systems, and to quantum computing that further destabilizes determinism and causality. "These are not technical illustrations," she has said. "They trace a lineage of how language becomes executable action." The Protocol Lexicon paintings, by embedding these historical references alongside the UCP's contemporary verbs and nouns, create a visual grammar in which different stages of executable language sit together and resonate, the punched card next to the protocol, the algorithm next to the API, the 1843 annotation next to the 2026 specification, a timeline compressed into a single surface, a history of language becoming action that spans 183 years and that is still, at this moment, being written.

The pairing of each painting with a .art internet domain is the series' most radical material decision. The domain is not a reproduction or a certificate. It is a functional component of the work, a digital counterpart to the painted surface that exists on the same network that the protocol governs. The collector who acquires a Protocol Lexicon painting receives not only a canvas but a domain, a piece of the internet's naming infrastructure that is as much a part of the work as the pigment on the linen. This pairing collapses the distinction between the painting and the protocol, the material and the digital, the handmade and the machine made, into a single object that exists simultaneously in two registers, the physical register of oil and linen and the digital register of domain names and IP addresses. The painting is slow. The domain is fast. The painting is made by hand. The domain is resolved by machine. The painting hangs on a wall. The domain resolves on a screen. Together, they form a single work that registers the condition of contemporary life, the coexistence of the physical and the digital, the handmade and the machine made, the slow and the fast, in a world where the verbs have become instructions and the instructions have become the language of a civilization that speaks, increasingly, through machines.