My First Day of Drawing

"The point is, that every piece of art changes your whole perception of the rest of the world for the rest of your life. And It's not a joke! And if it doesn't, then it's not art, it's a commodity"
- Lawrence Weiner

I agree art evokes an emotion, it can make you think differently about something. However you respond to a piece is what determines its validity. If it effects you in anyway (yours mood, ideas, inspirations, etc.) it has changed you, and that is something that can not be taken back so it is correct in saying that that piece would be art vs. commodity.
3D Art, such as sculptures, and installations, has really influenced my idea of media. The options are endless and an artist should never limit themselves.