Check out the Save Our Gravity homepage. Well, the question regarding the smell of gravity certainly raises extremely existential questions as it regards to perception. I could describe what gravity smells like to me, but the same sensation might not translate to someone else's perceptions. I mean, I have often wondered about why certain individuals are given to prefer certain foods over others that other individuals might prefer the reverse of. It all could well be that pork chops and their inherent tastes are translated as the same sensation as pineapples in another percieving individual and yet if minds could be interchanged no one could still tell the difference.
Gravity smells like the number twelve.