Triple Exposure using pure Red, Blue and Green filters to demonstrate the Colur Additive Theory: (from Wikipedia) "First described by James Clark Maxwell in the mid 1800s, the color additive theory describes how be perceive color and how they are created. Essentially white light is a combination of many different colors, a continuum of wavelengths organized into "bands" which we label with names (blue, green, red etc). When equal parts of each of the three major bands are combined you get white light. White light is the sum of red, green and blue. This is additive color." The only post-processing done was white balance and sharpening. Everything else was done in the camera, itself.