From previous posts, you may see that I like the sketches of Leonardo DaVinci, and one sketch typifies his attention to figuring out how the world around him can be broken down into rules, such as those of perspective and vanishing points.
Here’s the picture in question;
Now, I had always assumed that the two sets of stairs were the same width and the three arches in between were the same width openings.
I decided to check Leonardo, by using Trimble Sketchup and its matched photo feature, and redraw the stairwells and arches.
Here’s my model from the same viewpoint;
Now, as you rotate the model…
…You find that my assumption is incorrect;
Did Leonardo get his perspective wrong? It would seem an unusual way to build/design a structure. Does anyone know if this was just a practice sketch or did the building already exist?
Here’s the 3D SketchUp file so you can see for yourself (just under 7+MB); http://www.glynnseal.pwp.blueyonder.co.uk/blog/Sketchup_DaVinci_Perspective.skp
You will of course need SketchUp (free) from here – This is for the non-Pro free version; http://www.sketchup.com/intl/en/download/index.html
But you can also just download a viewer from here; http://www.sketchup.com/intl/en/download/gsuviewer.html