What are leaves? Leaves contain cells that have the chlorophyll which is the chemical that allows sunlight to be made into the food for the plant. That food is made into new cells that make more leaves and eventually, spores or flowers and then seeds in order for there to be more plants. The best way for these cells to maximize exposure to the sun is to be arranged in thin wide layers to form a flat appendage. This flat appendage has tubes that we call veins for water to come from the roots and the manufactured food to be carried down to other parts of the plant. But the ways in which these leaves are built up, their colors, their textures, their arrangement relative to the veins, are apparently infinite and very beautiful. These are only a few of the kinds of surfaces to be found on leaves.