One can derive the essential structures of a large number of common idiomatic expressions by combining the exciting perceptual qualities heat, fluidity, disorder, brightness, dynamism, upwardness or outwardness with each other. The same is true for their less exciting opposites coldness, solidness, order, darkness, stasis, downwardness and inwardness. Other popular expression structures can be derived by mixing the given qualities in pairs of more and less exciting opposites.