It's a stereogram poster! I'm on a mission to bring back these hidden 3D images from the 1990s, because they were the actual coolest. Except back then they were ugly neon nightmares, and mine are modern, cute, and funny.
This particular Stereogram is a nice tasty bottle of gin, the perfect piece of art to decorate your home bar.
Will it get harder or easier to see it the more gin your drink? There's only one way to find out!
To see the hidden image:
Relax your eyes while looking at the poster. Cross your eyes, then slowly uncross them while staring at the image.
Alternatively, try putting your face right up to the image, until your nose is basically touching it. Cross your eyes slightly, just enough that things are blurry. Then slowly pull away from the image. When something strange starts happening, focus on it instead of the background pattern.
Remember: The hidden image will only pop out while the pattern is blurry. It may feel uncomfortable to stare with blurred eyes, but it works!
Stereograms work because the hidden 3D image is in focus at a different depth than the poster itself. Crossing your eyes (or looking beyond the image) allows your eyes to focus at a different depth. The key to seeing them is to slowly work your way through different depths until you find where the image is hidden.