Billions of Sketches Reveal Hidden Cultural Variation in Human Concepts

This seems to be based on Google's QuickDraw datasets. 50 million samples are available in an open dataset,

https://github.com/googlecreativelab/quickdraw-dataset

There's a story in Rhodes' book on the atom bomb of Otto Frisch & Liese Mettner discussing the ideation of nuclear fission analogised to cell fission, drawn as a dumbbell viewed head on with the neck of the split a circle inside the bigger cell circle:, where we classically see two cells splitting side by side with a channel between them: she meant exactly the same thing viewed 90° rotated.

Sounds like a lot of sketches.