A windowing system does wonders to unify different screen sizes. Try making an application that runs equally well in full screen on an 11" MBA and a 27" iMac.

A windowing system does wonders to unify different screen sizes. Try making an application that runs equally well in full screen on an 11" MBA and a 27" iMac. The fact that windows can be roughly the same size on both machines gives you some common ground.