If I were to keep my insurance policy number in my car in the form of 9 bricks with a number on each one, I honestly wouldn't notice. The car would seem to driv

If I were to keep my insurance policy number in my car in the form of 9 bricks with a number on each one, I honestly wouldn't notice. The car would seem to drive exactly the same. There are even plenty of dead spaces to hide them where they wouldn't even noticeably consume cargo space. Yet for some reason I will not place 9 unneccessary bricks in my car, nor tolerate them if I discovered them already there. Is the "some reason" irrational?