http://ccat.sas.upenn.edu/george/yantra.html
http://www.meru.org/sriyantr.html
http://www.scn.org/tl/anvil/stereo/sriyantra.htm
I've also seen that music can be actually composed to reflect the geometrical structure.
I guess this will have a pretty powerful effect on the brain and the chakras. I've recently ordered a Sri Yantra CD and I am looking forward to receiving it...The sound vibration patterns which are generated by the many angles of the triangles of the SRI YANTRA were calculated by using the essential element of the circle around the triangular patterns, PI (3.1416) as the basic unit to which all the other ratios could relate. Therefore 3.1416 became a frequency vibration rate which, when doubled in value 6 times becomes 201.0624 cycles per second (or Hertz, ab. Hz) which is a sound tone equal on the international tuning scale of G+43 cents. Cents are divisions of micro tuning between notes on a piano keyboard. Each cent equals 1/100th division of sharp or flat between notes.
http://www.spiraloflight.com/sacred_geometry.htmRepresents the geometric structure of the sound of creation—OM.
I'd love to hear from you on the Sri Yantra topic!