The actual button is similar to a spring. The box underneath the button has a pink light on it, along with two other pink lights on the side.
When the switch is stepped on or pressed, it will undo all previous fault lines and will restore the level to its original position. They are usually in the level because the fault lines would not be able to be deactivated from where Zapo is without sealing off the newly made path. The switches act similar to a third hand for Zapo.