[ctdonath]

I've concluded art = that which was made to be looked at.

[Natsu]

I've concluded that art is anything an 'artist' can sell to someone, whether the sale price is reputation or money.

[mcv]

I've concluded that the best art is free, done by passionate amateurs rather than people looking to make a buck.

[nosuchthing]

Conceptual/performance art is often unsolicited..

Some art is simply about creating an experience for the recipients / audience /

[Natsu]

Right, that's why I put 'reputation' as one of the possible payments to the artist.