Robin

Again.
If I see Robin, I photograph him. Whatever his face does, the camera loves him.
I ran into him today and he was telling me how successful his hip replacement had been. Unfortunately the other hip is extremely painful, and there's a waiting list.
I'm not sure what I'd said to elicit this response, but I preferred it to his smiling face.
Now for the curve, and I'm going with the curve on his peaked cap.

The extra is a better example of curves in action. It's a bus shelter, one of several brutalist structures to hide in when the icy blasts descend on Blackheath, as they have done today.
It doesn't have windows like the beautiful ones in Canberra, but it's a similar style, and curves aplenty.

Thanks for hosting JacZero.