Placebo button

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A placebo button is a push-button that appears to do something, but actually has no effect, like a placebo. In other cases a control like a thermostat may not be connected.

Although non functional they can give the user an illusion of control. In some cases the button may have been functional, but may have failed or been disabled during installation or maintenance. Only in relatively rare cases will the button have been deliberately designed to do nothing.[1]

In many cases, a button may not appear to do something, but in fact changes the timing in a non immediately apparent way; this can give the appearance of it being a placebo button.

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[edit] Walk buttons

Many walk buttons at pedestrian crossings were once functional in New York, but now serve as placebo buttons.[2]

[edit] Elevator close buttons

Some door-close buttons in elevators are placebo buttons, although some of them do in fact change the timing, and others are only functional when activated with a maintenance key.[1][3]

[edit] Office thermostats

Some office thermostats may also function similarly.[4]

[edit] References

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