ID students: By the first year of your program, you ought be observing the objects around you during your daily life, noting how those objects' shadows fall relative to the ambient light source. (If you're not doing that yet, start!) And with any luck, your Drawing professor has broken out the geometric shapes and has you going through pencils like nobody's business.
But if you haven't been paying attention, if your teacher stinks or if you just need a refresher, watch industrial designer Eric Strebel's tutorial on how to draw and calculate cast shadows:
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