When you question if it could really ever get TOO large.
When you loose your child in it and can only hear a faint, "Mom?"
When you have to move 10 tubs of fabric to get to the shelf of fabric and see if that one particular piece is where you think it might be.
When you look at pictures on this board and think, "Oh, I have that fabric, and that one, and that one, and that one, and . . . . "