Perspective...

"It is also a very good plan every now and then to go away and have a little relaxation, for when you come back to the work, your judgment will be surer, since to remain constantly at work will cause you to lose the power of judgment. It is also advisable to go some distance away, because then the work appears smaller, and more of it is taken in at a glance, and a lack of harmony or proportion in the various parts and the colors of the objects is more readily seen."

Leonardo da Vinci, Italian engineer and painter

It's true...a bit of perspective goes a long way...