# Holons >[!info] >The fundamental unit or building block of the universe. The type of thing that almost everything, from hydrogen atoms to T. Rexes to humans, are. > >Simply, holons are "whole-parts," whole things that are parts of larger wholes. For example, atoms are whole, but also often parts of molecules, which are whole, but also often also parts of cells, which are whole, but also often parts of multi-cellular organisms, etc. As this is an extensively documented topic in Integral Theory, for now I will link to: An [article](https://integrallife.com/holons-the-building-blocks-of-the-universe/) on Holons from Integral Life, a site sanctioned by [[Ken Wilber]] discussing [[Integral Theory]]. The [Wikipedia page](https://en.wikipedia.org/wiki/Holon_(philosophy)) for Holons.