What must be true about a Chindōgu regarding its existence as stated in the Ten Tenets?

Answer

It must actually exist as a physical object.

Tenet II requires that the invention be an Exist-essential physical object; thought experiments or purely paper designs do not qualify.

What must be true about a Chindōgu regarding its existence as stated in the Ten Tenets?
inventiondesigncultureuselesschindogu