PUSH4 encodes Barnett Newman's Onement I (1948) into the function selectors of a Solidity smart contract. Each of the 375 pixels in the image exists as a function on the Ethereum blockchain, mined using a custom GPU tool that brute-forces function names until their 4-byte selector hashes match the exact color data required.
The title references `PUSH4`, the EVM opcode that pushes a 4-byte function selector onto the stack, the fundamental mechanism by which smart contracts route calls to their functions.
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