Stashed in: Reflection, Stairway to Heaven!, Best of Tumblr
Replacing a mirror with an affirmation is a very Tumblr thing to do.
Bonus points if they used the mirror to create disco stairs:
Clipboard. Select. Collect. Reflect.
Hershey Kisses and the Escalator
Falling Down Stairs Recovery gif
Sam, the Cat with Eyebrows