The Sriyantra of Devi is a great geometric design. It takes a lot of geometric perfection to get it perfect. When it is perfect, if you draw 2 lines bisecting the top and side both will cross at the central bindu and will also cut through the tips of the triangles and padmadalas on their path as can be seen in the pictures bellow. This Sriyantra mahameru is made perfectly both outside and inside.