Lost in translation.

A classic version of the 'What the client wanted' diagram with just a bit of spin.

This more developed version I created at Project Cartoon.

Knob off.

Rather than screeching to tell unwanted guests to go away or hanging a conspicuous 'Do Not Disturb' sign on your door, there is a more subtle and sophisticated answer to keeping unwanted visitors at bay – a doorknob that says it for you. 

Pull the sleek, pulley-activating handle on the inside and everyone on the outside will know to leave you alone. And if they don't get the message, they won't have much joy breaking in, as the door – dubbed the Doorknob Connection by designer Arnaud Lapierre – is made from super-strength industrial steel.

This piece of design and communication gets top marks from me for being equally strong conceptually and functionally.

Via Geekologie.