The author has a mental model of innovation which I don't think is accurate.<p>The patent system helps people look for "open spaces": new ideas, and work in them. He goes on to say that this eventually fills the space of ideas, pushing to a "paradigm shifting innovation" that "causes the hunt for open space to reset".<p>The problem with this idea of innovation is that it portrays it as a 2D space where no idea can stand on top of any other. His idea of innovation only includes new ideas that forever extend outwards at the same level. There is a third dimension this model does not capture: innovation that builds on top of other ideas. This third-dimension innovation is what is damaged by the current patent system, and why so many software developers feel so strongly against patents.<p>To the author's 2D innovation mental model, open source appears to be retreading the same ground over and over. To software developers, innovation can be seen in the third dimension.