I've been mulling this one over for days with no avail. I'm making a tank game, and part of the game is power ups. One of them, makes the player invisible.

The problem is, I can't think of a way to model an object that would relate to this object. Example, player picks up a shield for shields and a bomb for a nuke, a snowflake to freeze things in spot and a clock to slow down time. But I can't think of a model that would relate to invisibility.