"3 million years of art history in 150 minutes"

Last week Mr. Z talked about the different arts, what is art and how we interpret art. Also, what is the history of art ? There was the pebble he mentioned, if it was hand mande or what happened to it i my self thought it was hand made never thought is was a waterworn pebble. the pioneer were placed in pioneer spaces and crafted as a special message from earth as to say don't have doubts about it and it's true. Than there is what is art? art can be a message expressing there feelings, the survival adventure of a person or many may see a reflection of people in art or the thinking or people what they did and think. Art can be a specific thing and very descret thing to do. so what is art to others ?