Spike Idea

An idea for an interactive sensory experience, that at firt seems to relate to touch and texture (and even pain), that I had involves a button. When this button is pressed a number of spikes launch out of the surface surrounding the button encircling the finger which pressed the button. Although it appears dangerous and frightening the button pressor should not be harmed as the spikes do not come out of the button itself.
The spikes disappear when the button is pressed once more.