I want to present a cube to illustrate, and I want to color four of its sides. The colors will be blue, red, green and yellow; the two remaining sides should be clear or white or, perhaps, black. In part of this I want to show one color at a time, i.e. one side colored and the other sides clear or white or black. Thence I also want to show more sides colored, and if possible I also want to show overlap effects. How may I get this started?