If love, sorrow and fear were manifested physically.. what would they look like?

I think love is a lot like a smile. The more you show it to people the more you will inspire it in others, and in this way it is infectious.

I feel sorrow would be something like a blood disease, that weakens people and the more they submit themselves to it, the more negative its effects. :(

Fear could be a hermit crabs shell. They carry it with them, retreat into it and they often grow out of them and move on to find others, considering how they might have changed.

What an interesting question! Abstract.. I like it. :)