This special bookend can be ordered at monkeybusiness.co.il.
The principle: There is a magnet in the arrow that is attracted to the hidden metallic bookend on the inside of the book.
In my application I screwed a countersunk pot magnet CSN-25 into a branch.
It looks like the branch is growing through the books, made possible by a stable iron bookend on the inside of the last book.
Note from the supermagnete team: In this application, the countersunk pot magnet does not have direct contact with the counterpart (=bookend), which reduces its indicated adhesive force of 17 kg considerably. For details read our FAQ about pot magnets.
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