Plantar Fasciitis Symptoms and Signs. Plantar fasciitis causes pain and tenderness of the bottom of the foot. The tenderness is usually toward the heel, but the entire sole of the foot can be affected.
Additive color mixing is the kind of mixing you get if you overlap spotlights in a dark room, as illustrated at left. The commonly used additive primary colors are red, green and blue, and if you overlap all three in effectively equal mixture, you get white light as shown at the center.
Colored Shadows. Not all shadows are black. When lights of different colors shine on the same spot on a white surface, the light reflecting from that spot to your eyes is called an additive mixture because it is the sum of all the light. We can learn about human color perception by using colored lights to make additive color mixtures.