Riddles of the Sphinx

In Oblivion, there was a treasure riddle for a house you could buy: “I am two bodies joined as one, the longer I stand the faster I run”. An hourglass. The thing is, there are a bunch of hourglasses in the house you can pick up with no treasure. You end up second guessing yourself, thinking maybe it’s something else. But really, it was an hourglass, it was just also just hidden in a ceiling rafter. So that riddle doesn’t actually help at all, does it.