What is art, anyway?

After a discussion at breakfast about art and how it is defined, a question arose: If the same aesthetic mindfulness brought to the arts we have traditionally considered "official" (painting, music, theater, writing, dance, etc.) is brought to something most people would brush off as "ordinary" — say, pruning an apple tree, or setting the table for dinner, or folding laundry — can that be art too? And if so, what would your ordinary art(s) be?