You might wonder what an 'infinite loop carousel' is.

To be frankly, I don't know the exact name, so I named it like that.

Below is the example.

Below is the example that shows the trick.

1. Prepare two bunches (In the above example, the bunch is box 1, 2, and 3.) to cover the space which is made if one thing passes through.

2. Move the bunches.