No.

To put coins into the cup: put the big cup upside down, and put the small cup upright in the big cup, leaving a gap between the two cups. Use the machine light under the table to eject the coin. The coin will slide under the cup, shoot into the large cup from the table between the small cup and the large cup, and then bounce off the wall and bottom of the large cup twice before falling into the small cup.

The principle of putting a ring into an egg is similar to that of putting a coin into a cup. There are mechanisms at the bottom of the plate and under the black tablecloth. Before Dong Qing checked the eggs, Liu Qian had already put the ring into the mechanism. Before Dong Qing was about to break the egg, Liu Qian said "wait a minute". In fact, he used this time to let the ring enter the bottom of the plate through the spring. When the egg hits the plate, the mechanism starts and the ring "pops" directly into the egg yolk.

This is how Liu Qian changed.