Green Table by Jenny Holzer (1992) is a large rectangular table with dozens of "truisms" etched into the granite. I like this peice of art because it's something I think I could do.
I like that not only can you use the table as you would any other, you can perhaps gain some small nuggets of wisdom. However, some of the truisms are sexist towards men, and others just plain wrong, in my opinion. But I guess that's the point -- these are not truisms. Some are common sense, others are simply cleverly-worded opinion. Truisms on the table contradict other truisms. Read the list linked above and see for yourself.