"There is geometry in the humming of the strings,
there is music in the spacing of the spheres."
Sacred Geometry can be found in nature, music, architecture, art and is based upon the principal that all form is divine and that everything in our reality has its basis in Sacred Geometry.
I enjoy utilising Sacred Geometry in my artwork which can be found on the crystal grids, incense holders and clothing on my shop.
There are many wonderful and interesting sites that go into great detail on Sacred Geometry and its principles and uses, here's one to get you started ancient-wisdom.com