Different effects require different causes. For example, sweet tastes are caused by round atoms, of a good size. Sour tastes are caused by atoms that are bulky, jagged, and many-angled, without curves. Pungent tastes are caused by atoms that are round, fine, angular and crooked. Salty tastes are caused by angular atoms which are of a good size, twisted, with two sides equal.
Bitter tastes arise from atoms that are curved and smooth but very crooked and small in size.
Oily tasting things consist of atoms that are fine, round and small. For example, if there were not a virtually endless supply of the atoms which cause us to see surfaces as green in color or to taste foods as sweet, our visions of green things and tastes of sweet things would be far more limited than they actually are. One can illustrate the point using as examples letters of the alphabet. A large A and a smaller A differ in size. A and H differ in shape.