Dear all,

After having cooked about 40 crêpes (I'm French), I put them in a plate (whose edges are higher than the center of it) in order to form a pile.

The crepes at the top of the pile are curved, just like on this picture.

I'm sure it is due to the shape of the plate combined with gravity on top of the pile (the crepes are pulled down in their center of gravity, like the hypothetical ball on the image) but my roommate thinks that the crepes have cooked less in the middle than on the edges, explaining the shape. I'm pretty convinced that with truly uniform crepes the result would be the same. What is your explanation ?