The exercise that made me perceive, what I think, is the closest to what's meant by that what's described as "empty": 1st step) Imagine you have eyes in the ba

The exercise that made me perceive, what I think, is the closest to what's meant by that what's described as "empty": 1st step) Imagine you have eyes in the back of your head. 2nd step) Concentrate on trying to see what's behind you.