DD, almost 22 months, shocked the heck out me the past two days. She told me the microwave was going in circles, said the roof on a picture of a silo had a circle (sure does if it were 3d and you look at it from another angle), and then pointed up at a popcorn popper (cylinder shape) on the stove and told me it had a circle. When I lifted her up, she signed circle again and pointed to the lid. I know she knows a bunch of shapes, but I didn't know she could consider the shape of an object she isn't touching and figure out what it looks like at a different angle! She did a 24 pc jigsaw floor puzzle pretty much unaided this morning, too.