[irrational]

I studied linguistics in college and I remember a class on this. But that was 25 years ago. I think it had something to do with how much a part of the object the adjective is, or how easy it would be to change. Red concrete wall instead of concrete red wall because it is fairly easy to change the color of the wall from red to blue, but much harder to change the wall from concrete to wood. So we put concrete closer to the object and red farther away.