I'm not sure what side of the argument I'm ignoring, do you mind clarifying? I feel as though my argument is precisely predicated on adding additional considerations into the mix, rather than ignoring some component of the original point.
https://storage.needpix.com/rsynced_images/perspective-37858...
Basically, staring at one of the shadows on the wall and declaring confidently that you know what the shape of the solid is that produced it.