By overlapping up to three beam projectors, and placing any of six different colored filters in front of each, you can study color mixing.
The prism disperses white light passing through it. You can also place filters in front of the projector to pick out a portion of the spectrum.

General palette has beam projectors, prism (for dispersion) and colored filters (red, green, blue, yellow, cyan and magenta).

Graphics palette, including snapshot tool