The Executive Grid by Paul McCaig

Everyone knows the power punch that a Magic Square delivers to an audience. Here's a way to conveniently perform the effect with more confidence, in many situations. 

The Executive Grid is a specially designed, 110mm x 150mm, 16 cell grid, 4 x 4 Magic Square. It's been printed onto a handy-sized dry-wipe board, which will sit nicely in your pocket or as a perfect accompaniment to a corporate folio. But the real unique feature lies in the simple-to-follow crib, which is cleverly disguised in the mathematical formulae border design... no need for super human memory recall... no more hard-to-decipher crib stuck to your magic marker or notepad... no more embarrassing mind-blank or confusion... all is self-contained and in plain sight.