this may look like an ordinary computer mouse, but it has a secret... 
if you remove the palm rest, it reveals the top of the mouse ball. š¤
and there's a switch on the bottom. let's set it to "T"
now it's a trackball!
the switch underneath lifts the mouse ball up so it doesn't contact the desk surface.
mouse/trackball courtesy of @enginetankard
ā¢ ā¢ ā¢
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