Design that makes the world work smoother

Sometimes we forget that things were designed. Systems and objects conceived in someone's mind. Solutions devised. Problems analysed. People and scenarios enquired into and understood.
How's this for a successful ubiquitous design?

The ticket machine with numbered slips of paper and correlating display. 

I have seen this in shoe shops, train station ticket offices, official government passport or motor tax offices. And used internationally also.

I especially think this is wonderful because users are empowered - it's quite a straightforward system, uncomplicated, easy to understand - and if this system is not working out in the user's scenario, it's easily removed and another queuing method devised.

Sometimes the tickets and the screen are out of synch when the customer agent clicks for the next number "64?" and nobody appears but quickly, humanly, a little bit of eye contact among queuers, a decision by the customer service agent and the numbers are brought back to function. When used in the right places, I love it!

Seen in Gotheborg Design Museum:

Turn-o-Matic, M80
Queue ticket dispenser and queue number display
A&E Design AB, Stockholm, 1974
Tom Ahlstrom
Hans Erich