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Placebo button
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<p>A placebo button is a <a href="/facts/Push-button/ezRenR1v">push-button</a> or other control that appears to have functionality but has no physical effect when pressed. Such buttons can appear to work, by lighting up or otherwise reacting, which rewards the user by giving them an <a href="/facts/Illusion_of_control/FVhvVUWd">illusion of control</a>. They are commonly placed in situations where it would have once been useful to have such a button but the system now operates automatically, such as a manual thermostat in a temperature-regulated office. Were the control removed entirely, some users would feel frustrated at the awareness they were not in control. </p>