Illusions, real and not so real. You decide, but they all look good.

Sometimes it's coincidental, but mostly contrived to interest you.

Ships or arches?

Ah, yes! The moving blob illusion.

If it's real, who has an opener for this?

My favourite. Is it real?

 

There's an illusion here somewhere. Can you see it?

It's looks great from this angle, what about from the other side?