Contemplating the litterbox

Tulip has been up to some weirdness lately. She keeps going into the bathroom and sitting in front of her litterbox. She just "stares" at it. She does it like 15-20 times a day. There doesn't seem to be anything wrong with her. She's not going in there and straining to use the box or anything. She just sits in front of it and contemplates it. Freaky!