This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Quadrants in descriptive geometry. Created with Persistence of Vision Modern orthographic projection is derived from Gaspard Monge's descriptive geometry Monge defined reference system of two viewing planes horizontal ground and vertical backdrop These two planes partition space into quadrants which he labeled II III and IV own