I agree it's rude to do that 3D Illusion. But then again, on the other hand I don't think someone should ask for critical feedback if they aren't going to like it when they get well criticism either. And lots of the folks out there do get mad, really mad, if thats the kind of feedback you give them, eventhough, they asked you for precisely that.

So as I was saying I find its best to always walk the middle ground, and not say anything at all, if I can't say something nice that is.

"The Blood is the life!"