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“I give them stereoscopy and they give me the chance to play in nice observatories all around the world, you know — but also the animals.”

“Especially because a lot of those worlds don’t exist anymore,” said David Frackman, a computer programmer who wrote a master’s thesis on projected 3-D environments and was curious about stereoscopy.

She thought that technology would help—she wanted to make color films and, even more ardently, hoped to be able to work with “stereoscopy,” a.k.a. 3-D films.

The robot’s eyes were measuring the distance with machinely accurate stereoscopy.

An early version of the game, created in 2008, employed anaglyphic stereoscopy, a kind of 3-D effect triggered by wearing those paper glasses with the red-and-blue lenses that became popular in the nineteen-fifties.