When a yoruba sculptor created a human form, he or she made the head disproportionately large. The Yoruba is a west African tribe which is one of the finest artistic traditions in Africa. The arts of Yoruba are as numerous as their deities, and many objects are placed on shrines to honor the gods and the ancestors.
The three colors of cellophane serves as the light source for the set-up. The three colors would give different wavelengths of light to the sample in the jar. It is the independent variable in this experiment. Hope this answers the question.
