It’s a picture! It’s a program!! It’s Piet!!!
summary
Image files execute as code: contiguous color regions become integers, a direction pointer walks edges, and color transitions map to stack operations, so Piet is Turing-complete and actually computes. The talk shows concrete examples: pixel blocks as integer values, a stack-based push/pop/add/io mapping, and real artifacts — interpreters for other languages, an assembler, and a text-adventure written in Piet — all built and demonstrated to work.
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