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Li et al.: Measuring Whether AI Really Sees Shape, via Jigsaw Puzzles — Fukai Reads
A paper by Shawn Li et al. introducing JigShape, a benchmark for spatial reasoning in vision-language models. Interlocking tab-and-blank pieces make the ground truth unique across 95,468 instances from 4x4 to 16x16; only GPT-5.5 beat chance zero-shot (69.65% on 4x4), everything collapses from 8x8 even after fine-tuning, and removing the shapes drops 97% to 10%.
The Birth of the Jigsaw Puzzle (1760s) — The Man Who Cut Up Maps, and a Verb Unchanged for 260 Years
In 1760s London, the map engraver John Spilsbury mounted printed maps on wood and cut them apart along national borders, selling them as 'Dissected Maps' — the commercial starting point of what would later be called the jigsaw puzzle. This essay revisits the context in which the format was born as a tool for teaching geography, the structural insight that where you cut is itself the design, and the lineage that runs from Depression-era die-cut cardboard to the 2021 VR title Puzzling Places — a format that survived 260 years without ever changing its verb.
