There is no C.R.A.P without the P!

Proximity means "Nearness in space, time, or relationship."

When items are closer to each other in space, time or relationshop they come one visual unit instead of several separate units. When they are separate they become separate units and become distracting and unsophistacted looking. Use proximity so it is organized.  If a book didn't have proximity it would be all messed up. Instead, each chapter is divided and is nicely organized. Treat your page like C.R.A.P especially the "P" part!