The teacher starts: You experience the world the way you do because that is how it is perceived through your senses. Student inquires: Then how is it that everyone describes it the same way? The teacher questioningly asks: Which everyone? (implying of course that everyone else, including the teacher explaining this, is also part of that perception) The student suddenly feels completely alone...all alone in this entire system of existence! The teacher continues: Of course the mechanism of sensing is also "sensed" and hence non-existent; the "you" sensing the world also become the sensed. What remains is just the pure consciousness and that is the ultimate truth.