circular camouflage

One might think initially that this false stonefish (Scorpaenopsis diabolus) is rather well camouflaged....

But then there is that big circular ring of pectoral fin rays it sits on. I mean that must be a bit of a give away right?

In response to that I would point out (on behalf of the aggrieved pseudo-stone) the prevalence in the region of these Fungia corals.

Not so easy now is it? In truth the fin rays and the eyes are the two things I usually notice immediately before my brain clicks into gear and I think "[ah scorpion/stone/devil[delete as appropriate]] fish" but I guess the point here is that eve if visible to prey that ring isn't such an unusual pattern on these reefs.