Sitting under a tree is just representative. You will be surprised to know that after Buddha's death, for five hundred years his statue was not made. Instead of a statue only a tree was made. For five hundred years, in the temples that were made and dedicated to Buddha, there was only a tree carved on the stone or marble, nothing else.
It was enough to remind one to step out of the road, because this has been for thousands of years the tradition, to plant trees on both the sides of Indian roads – huge trees with big branches almost meeting over the middle of the road so the road is completely covered with shadow. Even in the hottest summer you can go on the road in coolness, in the shadow.
So the tree became the symbol of dropping out of “the road.” The road is the world, where everybody is going somewhere, trying to find something, and in fact basically trying to forget himself because it hurts. To remember oneself hurts, and the only thing that everybody is doing is to get engaged, concentrated – after money, after power, after this, after that. Become a painter, become a poet, become a musician, become someone and go on becoming. Don't stop, because if you stop you become aware of your hurt; the wound starts opening up. So don't give it a chance. This is the road.