Many people who like magic know the principle of magic four rings. What does this principle mean?

The principle of the magic four rings is that four separated iron rings can be connected and separated at will in the magician's hands, one of which has a gap of about 1 cm, two of which are connected together, and the other is fine.

The order of taking rings also makes sense. The notch ring is placed in the first position, the two connected rings are placed in the second position, and the common ring is placed at the end.

Magic is to grasp the characteristics of people's curiosity and thirst for knowledge and create all kinds of incredible and unpredictable illusions, so as to achieve the artistic effect of confusing the fake with the real.

Extended data

Nine-chain principle:

It takes 256 steps to untie the nine-ring * * *, as long as the next ring is connected, even if it is a step, it is not sliding on the shelf. I hope everyone can solve this problem through independent thinking. The expansion and nesting of nine chains are a pair of inverse processes. This solution is based on the same principle as computer gray code.

The rings of the nine-ring chain restrict each other, and only the first ring can go up and down freely. In order to get down/up the nth ring, two conditions must be met (except the first ring).

1.n- 1 ring on the rack;

2. None of the rings in front of the n-1ring are on the shelf.

Playing nine chains is to try to meet the above two conditions.

In essence, to untie the nine-ring chain, we should start from the back ring, and the front ring should be removed before the back ring can be removed. The front ring should be installed, not really removed.