There's really a cat, but his shape is so bad... Don't looks like a cat at all...
I can't tell you how to see it, but, I've found that explanation:
“Bring the stereogram image really close to your eyes (until you touch it with your nose).
At this distance your eyes cannot focus on the image and they look somewhere behind the image. Now, slowly push the image away from you, while trying to keep the eyes off focus. At some point you will see the hidden image.
Another method is to take an object and put it behind the image (about half of meter behind it). Now, focus on the object behind the image while keeping the eyes looking at the image.”
(●'◡'●)
Can anyone see the cat in this picture or do I just not know how to cross my eyes?
http://www.mangago.zone/read-manga/saijou_no_meii/an/saijou-no-meii-chapter-1.html/25/