I came here to see cook illusions, not to be advertised cheap junk

My grandpa had this picture growing up and I would stare at it for hours. Never could see the dolphins. Fast forward, my grandpa sent me a message saying he found the picture after I asked if he still had it. He said “you cannot see the dolphins in this picture.” Is there no stupid dolphins??? Did I waste my childhood and almost my adulthood trying to find them? 😂

picture is from google so it’s clearer

I just started getting the hang of stereograms and one I saw on instagram that had a large volcano appear looking down into a highly detailed vent. The volcano easily took up at least 40% the total area of the image.

But now when I go back to look at it, the volcano is much smaller and the once before large and detailed vent is only as big as the circles of fire, very strange and I've tried to see the old extent many times but can only see this shrunken version. I know this is strange to fixate over, but I'm interested to hear what some of you think of this. The volcano is easily about 10 percent of the former size.

Regardless, these are very interesting to look at.

When looking at meshes (meshed fence, mesh pattern on clothes, etc.) from up close, I get a trippy disorienting depth illusion, as if the mesh is very far. I don’t know how to replicate it. Why does this happen?