SIFTs are rotation invariant. However, they are not good for classification. Anyway, the early layers of an NN should be performing an encoding that creates sc

SIFTs are rotation invariant. However, they are not good for classification. Anyway, the early layers of an NN should be performing an encoding that creates scale and rotation invariance though, so that later layers can classify. That's what makes this result interesting. Well that and the ambiguity matches the human ambiguity.