This project reveals the lost secret of the old masters. The graphical analyses reveal the crucial role of the sacred geometry in the spatial structure of the masterpieces by the old masters. This discovery, which is still waiting for world acclaim, restores merit of the old masters and refutes the camera obscura theory. These graphical representations of the hidden geometry behind the masterpieces were not yet published and the secret knowledge of the old masters is being revealed for the first time ever. Visit the website: https://www.renaissanceperspective.eu/