Borrowed Ring On String
Item Number: TA7793
Imagine borrowing a ring, then cutting a very thin length of string from a spool.
The string is given to the person who loaned you the ring. A book is placed upright on the table. While the person holds both ends of the string, its center is dropped behind the open book. Take hold of their ring and place it is placed behind the book, too. She's instructed to never let go of the ends.
After a moment, you ask her to raise her arms slowly.
The full length of the string comes into view.
As the string's center emerges from behind the book, her ring is threaded on the string!