Here's an autostereogram bathroom. Look closely... and you can see... an image of someone...
Single Image Random Dot Stereograms or ‘random dot stereogram’ specifically refers to pairs of images based on random dots. Some science guys with lots of funding and lots of time developed this system of hiding images within dots. These are known as Single Image Random Dot Stereograms (SIRDS, not to be confused with SARS, which is a disease of some sort), or Random Dot Autostereograms.
Replacing the random dot base pattern with an image or texture gives the form that made the Single Image Stereogram known to the general public, through the Magic Eye series of books.
Here’s an autostereogram bathroom. Look closely… and you can see… an image of someone… pooping in the shower?! Gross!