picked up some old gaming stuff today; one of them was "awesome super nintendo secrets 3".
Since I needed to take a really big and satisfying dump, I decided to use it for reading material. As I flipped through it, I found pages printed with random dots. "for viewing instructions, see page xxx" - Magic Eye! a blast from the past. Except they weren't called that, they called 'em SIRDS (single image random dot stereogram), and they were black and white, not color.
Anyway, they were mostly pretty simple geometric shapes. A couple featured dolphins. really had nothing to do with the book at all; I guess they just wanted to fill blank spaces with something. I remember geometric shapes and dolphins being the most popular subjects of 'magic eye' sheets. they used to run on the last page of the Sunday funnies. Then they went away without much notice, like pogs or the power rangers. oh well.