This simple, clever mug automatically indicates its current state of mind when you pour a hot beverage into it.

In its dormant state, the mug offers a black “OFF” display, but once your hot coffee or tea hits the inside, it gradually transforms to read “ON”. A heat sensitive pigment changes the color of the mug from black to white.

While it may be designed for coffee, the $25 mug is Charles & Marie’s “Soupe du Jour” offer of the day. So if you want one in time for the holidays, you better grab yours now.