But Mozart wrote an opera called The Marriage of Figaro, no matter how often it has been produced. But they also weigh about the same and have roughly the same electrical resistance, and these specifications can be considered part of the coins' form too. The concept is not restricted to geometry, but is a little more abstract. If you think of an experiment as a kind of interrogation, intended to extract information from its subject, then you will see how we get from the concept of form to that of physical information. These are different terms for the same thing.
Physical information is simply the form, or structure, of physical things.
An example is the relationship between physical information and entropy . According to Roy Frieden, the laws of physics are generated by the attempt to minimize the difference between an entity or system's own, physical information, and the information that physicists can obtain about it. B. Roy Frieden, Physics from Fisher Information, Cambridge University Press, 1998. To view physical structures in terms of information is to see every object as embodying its own description. Any information we might have about the object has that intrinsic description as its ultimate source, and refers back to it.