According to Descartes, there are three kinds of ideas: innate, adventitious, and factitious. Like us, he believes that ideas are something in the head. Innate ideas are, more or less, inborn, i.e., placed in us by God. Adventitious ideas are ideas along with the judgment that the idea represents something that actually exists in the world. Factitious ideas are fictions made up by the human imagination by combining parts of adventitious ideas. These can be a little hard to understand so be the first person to give me examples of all three and you’ll get a bonus for the week.