For questions involving physical interfaces and interactions with "real world" objects.

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27
votes
10answers
3k views

Traffic lights: “yellow” is progress, not state

When thinking about how (real-world) traffic lights work, I wonder if there is a more intuitive way to display the yellow light. The meaning of Green and Red are states: Green: Ok, you can go! Red: ...
14
votes
3answers
1k views

What is the reason for Concave round buttons in Elevators

What is the reason many elevators have concave shaped buttons. Like this: Any special reason behind this?
2
votes
3answers
664 views

What is the best user interface you have ever used/seen in real-world or real-world objects? [closed]

Exclude all web/mobile/application/computer software interfaces.
5
votes
4answers
1k views

Should a light switch be small or big, or does this depend on other factors?

Small and big light switch compared: It's strange that this usually differs by country. The big ones are easier to hit, but the small ones provide better feedback (if you don't immediately see the ...
7
votes
2answers
268 views

Do manufacturers of markers produce different shapes for each type (whiteboard/permanent) so you can tell the difference by touch?

In the sense that this is an interface with the user of pens, I thought this might be an acceptable place to ask this question, but if it's just application interfaces, then please remove or close ...
25
votes
7answers
8k views

Why does the Redbox machine have barriers around the credit card swipe reader?

Perhaps you've seen one of these before. A couple of inches above and below the magnetic stripe reader are protrusions that allow just enough room to swipe a credit card. The barriers are a ...