My favorite artist is M. C. Escher and he describes his dragon lithograph (my favorite of his works) in the following paragraph:

"However much this dragon tries to be spatial, he remains completely
flat. Two incisions are made in the paper on which he is printed and
then it is folded in such a way as to leave two square openings. But this
dragon is an obstinate beast, and in spite of his two dimensions he
persists in assuming that he has three; so he sticks his head through one
of the holes and his tail through the other."