I have always been facinated with the language of sacred geometry. It is pure it is universal and it has a way to make complex things simple.
It can be used to meditate, to focus your mind and organize your thoughts or to get inspiration.
Last weekend I got one of the pictures of Jon Asle Rivelsrud. I liked it so much I thought I would make my readers aware of his art too. (Go to his page starnation.no)

Tree of Life
Is the most condensed symbol created.
It belongs to the Kabbalah tradition and could be defined as spiritual mathematics
If you want to read more about Kabbalah look at my kabbalah pages here.