Only the green and blue lights are turned on. You see a blue shadow (the shadow of green) and a green shadow (the shadow of blue). The shadows are not at the same height since the blue light bulb is mounted higher than the green light bulb. Notice that the blue shadow is higher. In this photograph there is no white light and the area where both blue and red lights shine is blue-green or cyan. This makes the green shadow, which is mostly surrounded by the cyan, look off-green and perhaps a bit yellow. Hold a white piece of paper next to the green shadow and you will see it really is green.

Only the green and blue lights are turned on. You see a blue shadow (the shadow of green) and a green shadow (the shadow of blue). The shadows are not at the same height since the blue light bulb is mounted higher than the green light bulb. Notice that the blue shadow is higher.

In this photograph there is no white light and the area where both blue and red lights shine is blue-green or cyan. This makes the green shadow, which is mostly surrounded by the cyan, look off-green and perhaps a bit yellow. Hold a white piece of paper next to the green shadow and you will see it really is green.