This is a clear example of Escher's style, and one of his more
popular works. In the bottom of the paper there is a man holding a
cube whose segments connect from front to back, and back to front.
Notice the paper with the drawn cube at the man's feet. It is
impossible, for instance, to determine which lines create the front
and the back of this cube. In reality such feats are obviously
impossible. However in a two dimensional world, these tricks become
realities, as is depicted in Belvedere. The expression on the
cube-holder's face is that of bewilderment, and is apparently
oblivious to the manner in which the structure behind him was
constructed (precisely the same bemusing style of architecture). Not
only are forward poles connected to the distant side, but the ladder
in which this couple climbs creates the illusion of reality, when it
is physically impossible to do so in a world such as ours.