STEP ONE: HOLD YOUR HAND IN FRONT OF YOUR FACE. LOOK AT IT. STEP TWO: THINK ABOUT WHAT YOU SEE OF YOUR HAND. DON'T THINK TO HARD ABOUT WHAT IS OR WHAT IT'S SUPPOSED TO LOOK LIKE. JUST THE PURE SENSATION OF SIGHT. THINK ABOUT THE FORM, THE COLOR. STEP THREE: NOW DO THE SAME THING BUT WITH YOUR HAND BEHIND YOUR HEAD. WHAT DOES IT LOOK LIKE? WHAT COLOR DO YOU SEE OF IT? HOW DOES THE LIGHT INTERACTING WITH YOUR HAND INTERACT WITH YOUR EYE? IF YOU DID IT RIGHT IT SHOULDN'T LOOK LIKE ANYTHING, GOOD JOB THAT'S WHAT NOTHING LOOKS LIKE.
I'D ALSO LIKE TO NOTE THAT IF AT FIRST YOU IMAGINED A BACK VOID INSTEAD OF A WHITE ONE, THAT IS ALSO WRONG.