Refracted Light

The Exploratorium has mounted large prism filters over some of its skylights, and, late in the day, sun shining through those filters creates very large rainbows on the Exploratorium walls. There is something very satisfying about seeing a spectrum four feet wide and one foot tall splashed on a wall. It's nothing like the pipsqueak spectra that anyone can produce using the standard prism sold in most museums stores. When looking at a very large spectrum, one can clearly see all of the colors, and how they fade into each other. Sometimes, scaling something up can have a huge difference.