You cleanly show you have one bottle and one empty tube. The tube is 100% completely empty! The bottle is placed on your hand and covered with the tube. You lift the tube and the bottle has turned UPSIDE DOWN! You turn the bottle over, right side up, and cover the bottle with the empty tube. The tube is lifted to show that the bottle is still right side up. The tube is lowered again and like magic, when the tube is lifted once again, the bottle has turned upside down AGAIN! An amazing illusion! Self-working! Very easy to learn! Very easy to perform!