Was trying to move on to stereograms, got a bit sidetracked.

Black and white photographs are made into anaglyphs using Affinity Photo.

Make simple anaglyphs with line art.

Making simple anaglyphs with text or line art.

Use materials at hand to make children feel like secret agents.

A chance encounter with some AirBnB decor has me obsessed with anaglyphs and stereograms.