# Information is an Abstract Entity [Information](Information.md) is purely [Abstract](Abstraction%20(Computer%20Science).md). The original theory of [Computation](Computation.md) regarded computers and the information they manipulate purely abstractly, as mathematical objects. Many mathematicians to this day do not realize that information is physical, and there is no such thing as an abstract computer - only a physical object can compute things. Physicists have always known that [information has to be a physical quantity](Information%20Requires%20Physical%20Instantiation.md). And yet, its information is independent of the physical object that it resides in. For instance, if two people were having a conversation of video chat, the information may start as electro-chemical signals in one's brain, then it gets converted into signals in nerves, then into sound waves, then into mechanical vibrations of a microphone, then into electricity, and so on. So *something* has been instantiated in radically physical objects which obey different laws of physics. And yet, in order to describe what has happened in this process, you have to refer to the thing that has remained constant - which is only the information, rather than any physical thing like energy or momentum. --- Date: 20241215 Links to: Tags: References: * [Constructor Theory. @DavidDeutschPhysicist - YouTube](https://youtu.be/pOzNwnW0wtU?t=94)