This is best viewed with standard ChromaDepth 3D glasses. They pull warm colors to the foreground (red, orange, yellow) which creates the illusion of warm colors floating over the image. Green serves as a neutral middle ground color. Cool colors (blue, indigo, violet) are pushed into the background. This makes it look like these colors are sunken into or below the image. Black and white accentuate the stereoscopic illusion. When you increase your viewing duration and distance, the stereoscopic optical illusion is stronger.