Search on the internet, and you will find much written about the Sri Yantra (loosely meaning 'great object')
It is exceedingly complex, mathematically, to construct it perfectly (mine is not perfect!) It is generally used as a focus of meditation (tantric or otherwise). It has connections both to Hinduism and to Buddhism.
For me it is a fascinatingly dynamic and complex representation of the Cosmos, having both practical and spiritual associations.
Originally I designed this flash animation of the Sri Yantra to fly apart at the 'end' and then to reform, looping endlessly as an association with the expansion and contraction of the universe. Some people liked it this way, and others were quite disturbed by it. I decided to make this one a bit calmer and allow it to gradually fade out instead, before reforming.
Some people have told me that they like to use the animation as a meditational focus....
I hope you will enjoy looking at it, whether you choose to use it that way or not. If you are interested in learning more about the Sri an internet search or a visit to the library will net you extensive (and sometimes conflicting) information about it.