[MrMontyBurns]

Any state is equally improbable. It's human judgement to tell something was special or not. If all states are all possible combination of numbers in a lottery, you just call 1 combination "I won" and all the others "I lost". Same thing applies to a cleaned up room, any arrangements of objects in it are equally probable, but the number of states you would call cleaned up are so much less than the messy ones, so you can say a cleanup up room is less likely than a cleaned up one (unless you do something about it :P) This is also the fundamental of entropy btw.

TL;DR By grouping states together (human choice), certain arrangements seem more probable than others.