Since the issue of what the physical came up in a comment b y Amandalaine in the combox for the "computers" entry, I thought I would explain further.
In my view, there are four things that have to be lacking for something to be considered "physical."
1) Intentionality. At the most basic level of analysis, no physical thing is about any other thing. Intentionality, if it exists, is a system by-product.
2) Purpose. There is apparent purpose which is explained away in terms of Darwinian function.
3) Subjectivity. Physical things, per se, have no point of view.
4) Normativity. Nothing about the physical entails that some physical state ought to exist as opposed to some other.