Answer:
You use it between your head and your toes, the more it works the thinner it grows. What is it?
Temporary evidence of where you've been strolling
What smells the most in the kitchen?
Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
A canvas full of stars.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.