From The Geometry of the Last Supper by Raphaël Mouterde. It shows the triangle on the grid and the arc created by the rotation of the side of the triangle to the vertical. The main perspective line suggested by the top of the tapestries has the same slope than the diagonal of the grid and is tangent to the arc.
🤓 Nerd’s corner: for the truly dedicated geometry fans... what is the height of the vanishing point B?
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