I found the chess set to be much easier to view in 3D; I just unfocus my eyes while looking at it and it jumps out. Neat.
I had to try several times to see the shark, and it was still a bit vague for me. That was a much tougher one to see for me.
Edit:
I couldn't see the shark at first, and usually these images are easier for me, so I followed the link back to its source and found those instructions below the pic. I posted them in case folks were having the same trouble with it that I was. I'm thinking it's harder (for me) because it's not a static image.
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