The formula (Main Color Of Object ?OBJ ?COL) means that the tangible thing ?OBJ is almost entirely colored with the color ?COL. For example, a brown bear may have green eyes and white claws, but we would still say that the bear is brown. Therefore, (Main Color Of Object brown bear brown) would be true. An example where it is NOT appropriate to use this predicate is to describe a zebra. Since a zebra is roughly equally black and white, we would not say that it is primarily either of those colors. In this case, it would be better to use Object Has Color. One should think of the expressions of the form 'The OBJECT is COLOR' when using this predicate. For example, even though an apple may have a brown stem and a green leaf, we would still say 'The apple is red'. Contrarily, we would NOT say 'That zebra is black'. Likewise, if we had a shirt that was 49% red and 51% green, we would NOT say that the color of that shirt is green. If we had a shirt that was green with a small, white insignia on the pocket, we WOULD, in this case, say that the Main Color Of Object, this shirt, is green. See also Object Has Color and Uniform Color Of Object.