This is clever. I’m sure someone can think of a science-fictional application.

Originally shared by HACKADAY

Here’s how to use the Moiré effect to create patterns which change depending on how they’re viewed.

[Tom Scott] ran across an interesting visual effect created with Moiré patterns and used for guiding ships but we’re sure it can be adapted for hacks somewhere. Without the aid of any motors or LED animation, the image changes as the user views it from…

http://hackaday.com/2018/04/07/using-moire-patterns-to-guide-ships/