Direction arrow for Uno

Has it ever happened to you that you're playing a chaotic game of Uno and suddenly people lose track of which direction the game was going, leading to a long discussion on causality that eventually also leads to losing track of whose turn it even was? Well, it kept happening to my group, so I made this. It's a very basic arrow that you can use to indicate the direction of play, then flip as soon as anyone plays a change-direction card.

You might want to mirror the file before printing, as I designed this arrow counterclockwise by accident (I made this hastily, during a particularly lengthy argument about the direction of said game), so at the outset of the game, the arrow needs to be upside-down (unless you're brave enough to start the game counterclockwise, that is).

May the +4s be with you.