Whats The Trick To Cubefield Whats The Trick To Knowing Whats On The Exact Opposite Side Of A Dice?

Whats the trick to knowing whats on the exact opposite side of a dice? - whats the trick to cubefield

If you roll the dice on a flat surface, obviously there are a number. But what is the point directly on the underside of the upper row? ... I know it's a trick, but what is it?