Onion skin.

Peeling this onion the other day I was fascinated by this bit of skin that came off in one large piece. It's looking deep into the centre, not the other way round.

[Phil Sandford]

That is definitely one of those photographs that you don’t know whether it’s concave or convex. Very well done.

[Helen Jane]

Can't stop looking at this because my eyes can not settle for it being either convex of concave.

[Carole Sandford]

What a delightful shot! I agree with the convex/concave thing!

[Valerie Chesney]

How innovative & makes a super shot.