What we see isn’t there

Eye (1946) by Escher pedrosimoes7 is licensed under CC BY 2.0

When I was a child, I came across an old book of prints tucked away in a dark corner of the library. There was a particular print which caught my eye. It was called Relativity by the artist Escher. I was drawn in by the faceless people (or was it one person) walking up and down the never-ending stairs and the scenes outside the windows — each one right in itself but contorted into different planes when seen as a whole.