A picture is worth a thousand words, so to save me thinking of ways to say how cool this is, just take a look:

Escher's Relativity in Lego by Andrew Lipson

Escher’s Relativity in Lego


Escher's Relativity

The original woodcut


Escher’s Belvedere in Lego and woodcut


These amazing Lego sculptures were made by Andrew Lipson and Daniel Shiu.  More Escher constructions can be found at Andrew’s website here.