A Key

A key is a specialty tool used to solve a puzzle mechanism with a single movement. The aim behind both key and mechanism is to both disable and enable the use of a door, lid, or other impediment panel. They can also be used to activate or deactivate mechanisms which govern the catalyst behind the function of many types of machines. They often get lost at inopportune moments, leading to much frustration.

[A Key Sketch]

Sketch by Walter Mensch