# Universality 1. [Universal Computer](Universal%20Computer.md) 2. [Universal Explainer](Universal%20Explainer.md) 3. [Universal Constructor](Universal%20Constructor.md) 4. [Critical Universality](Critical%20Universality.md) Consider [Universal Computers](Universal%20Computer.md), [Universal Constructors](Universal%20Constructor.md) and [Universal Explainers](Universal%20Explainer.md). They exhibit a common theme. They each refer to an entity that can perform _any possible action_ from the set of all actions in their respective domains, as long as they abide by [The Laws of Physics](The%20Laws%20of%20Physics.md): * A universal computer can perform any [Computation](Computation.md) * A universal constructor can construct any possible construction * A universal explainer can create any possible [Explanation](Explanations.md) Universality makes it clear that the fundamental limit on capability of a universal system is determine by [The Laws of Physics](The%20Laws%20of%20Physics.md), not by some arbitrary design. For universal computers, the limit is defined by what can be computed according to the laws of physics. For universal constructors, it is what is physically achievable. For universal explainers, it is what can be explained through a logical system of reasoning. --- Date: 20240909 Links to: Tags: References: * []() [^1]: See more in [this great conversation between Sam Harris and David Deutsch](https://youtu.be/anRrR0XjFK0?t=2858)