Absence makes the heart grow fonder. Two heads are better than one. All that glitters is not gold. Clothes make the man. You can't tell a book by its cover.
Many hands make light work.
Too many cooks spoil the broth. Better safe than sorry. Nothing ventured, nothing gained. You many have noticed that the columns were meant to represent the left and right sides of your brain. Although they contradict each other, both sides make a lot of sense.