The Efficient Cause and the Carpenter

Aristotle was trying to learn how many kinds of answers there are for why questions. He wanted us to see that we can't understand things without invoking their form and m ter as well as their efficient causes. The cause is the carpenter or, more generally, the thing which brought about the change. But if this is a cause, it's a cause in a very different sense. There are no purposes or goals floating around free in the world.