There are many differences in both photos, and your assignment is to spot all of them. The only problem is that I can not remember how many differences there are altogether. But if we all work together, I’m sure we’ll find them all.
If you concentrate on one of the lobster's eyes, after some time (10-15 seconds) it will seem that the broken piece of the plate rejoins the rest. This amusing effect occurs because our brain tends to 'iron' out broken our saw lines.