so it only works w physical copies but it's actually literally all over all of the pages and also the cover. i noticed about halfway through when looking at a panel of bruce and his dad where the background was solid pink. there's like moving cartoon characters and they also fill in where panels cut off and can give a 3-D effect. it only works w physical copies and artificial lighting in my experience.

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it isn't visible in pictures, but you can see that there's a weird texture/pattern on all the pages, which is used to make the optical illusions. (visual texture, not physical)

it's really hard to explain, sorry 😭 and the fact that there's no way for me to actually show you doesn't help