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:
Inclined plane . it Tavola preparatoria per l'esecuzione della prospettiva quadro obliquo dall'alto del solido rappresentato Il file stato creato scandendo il disegno con uno scanner Private study Luciano Testoni Check categories June it Prospettiva Evolution of Perspective Evolution of Perspective Perspective drawings