As we all learnt from kindergarten and MasterCard, the best things in life are priceless.
But what if you did put a price on them? What would it be? And why do we class something as valuable in the first place?
We asked people to show us the most valuable thing they owned, tell us whey they valued it so much, and whether they'd sell it to us for a hundred grand. From a pair of glasses, to an iPhone, to a hard-earned medal, value is clearly about as subjective as it gets. Take a look: