I have to defend my picture against Peterleichens accusation of the building to be a new one. Yes, it is new - and yet old. Mushrooms are one of the earliest creatures inhabiting the earth. So as a concept of building they are the oldest. Also the form of the building can argued to be incredibly old too. And then the mushroom itself which makes up these pop up builds every year and made this one too - who knows how old he/she/it is. It may have lived in the ground like ages. So I agree that this particular pop up building is new and will be gone in a week possibly, but from all other aspects considered it is the oldest building there can be and the oldest form as well. It is possibly almost exact replica of another pop up building that was like million years ago - which is something that can not be said of any other building seen in this competition. But - there is no cat in the picture. I think there was one - before the Boogie Bump ate it.