Here's how this one plays out. The most advanced and tricky part is putting the shadow on the box at the left side (NPQR). Note: the shadow of F falls onto the side of it. Below the shadow of F, the Law of Parallels takes over, and the shadow edge runs straight down the side of the box.
To the right of the shadow of S (the "top" corner of the object), the shadow edge runs back to its origin, the unseen plan of S.
Click on the art to see it bigger.
JH
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