Being very visual myself, I have always totally related with this expression.
The series of great animated maps on this site prove once again that pictures (even more when animated) are very powerful ways to explain and demonstrate facts or concepts: www.mapsofwar.com
He is for instance the one they have on the history of empires in the middle-east:
note: not all maps are that correct though, for instance the one on history of democracy. But the concept is still a very powerful educational tool with the right data points.