Activity

Hi Sharon- the lesson for this overlap exercise is that these are elongated cylinders (such as dowels, etc). In that case the area where the underlying dowels are crossed by a dowel, there would not be a cast shadow on both sides of the crossed, lower dowel. On a vertical dowel that is crossed by a horizontal dowel the area below the horizontal dowel would have a cast shadow, but above that horizontal dowel it would not have a shadow because it is closest to the light source. The same holds true for when a horizontal dowel is crossed by a vertical dowel – the area on the vertical dowel, above the horizontal dowel would not have a cast shadow. There might be some items in your home you could use to set up a model with the appropriate lighting. Items like pencils, chop sticks, dowels, etc.
On your drawing it looks like the crossed dowels are notched out to accept the upper dowel, rather than them being cylinders resting on top of each other.
Some of your cast shadows curve to illustrate that these are cylinders, but some are straight and they should be altered to curve.