A view of the pelvic floor. The crosshairs of the diamond shape meet at the body’s conceptual core. From Taking Root to Fly

A side view of the  sacrum . From  Taking Root to Fly

A side view of the sacrum. From Taking Root to Fly

The keystone of an arch is an apt equivalent to the sacrum, which lies between the two hip bones. From Taking Root to Fly

Aerial view of the shoulders (head and neck not included). The crosshairs of the diamond shape meet at the body’s conceptual core. From Taking Root to Fly

See the sacrum’s position between the two pelvic bones (os innominati) as they demonstrate the function of a keystone. From Taking Root to Fly