All property is intellectual

Is it?

I found this fascinating essay via Twitter - I've never heard of the author before and therefore cannot vouch for him beyond what I've read in this essay.

The idea that intellectual property is somehow fraudulent as a concept is something which all too many people seem to take for granted these days. Too many of them seem to be able to see that intellectual effort is every bit as real as physical effort and just as capable of creating value, yet not be able to get from there to the idea that the product of intellectual effort can be just as much property as the product of physical effort. Even when the product of intellectual effort - such as a novel or computer program or symphony - is given physical form - as a book, disk or sheet music.

So is all property intellectual? What do you think? Post your thoughts in the Comments section.