Very rare prototype element

In 2020, the LEGO Group collaborated with Unbound to create an in-depth book. The topic was chosen by LEGO fans and the book was crowdfunded. One of the pledges offered a very rare prototype element and here is the first look at the said element. It is a kind of springy pogo stick and has a working spring function. It can also be held by a minifigure.

Only 500 of these unique LEGO elements were made and unlike normal LEGO pieces, these are 3D pieces similar to the recent LEGO House Duck element, more of which later....