The Theory of Everything (in German: Theorie von Allem or Die Weltformel) aims to unify quantum physics and the theory of relativity into a single comprehensive theory that provides a consistent description of nature at all scales. The theory of relativity describes gravity on cosmic scales, while quantum physics explains the nature of particles on microscopic scales.

The challenge of a Theory of Everything lies in the fact that different fundamental forces and particles of nature interact and are described in very different ways, requiring the integration of knowledge and methods from various areas of physics and mathematics.

There are various approaches to achieving such a comprehensive theory: The most well-known is the so-called "string theory." It posits, in simplified terms, that all fundamental particles and forces in nature are made up of tiny one-dimensional objects called "strings," which vibrate and oscillate in a multi-dimensional space, and the way the strings vibrate determines the various particles and forces observed in nature.

Another approach, based purely on mathematics, is pursued by the American theoretical physicist Garrett Lisi with his E8 theory.

Garrett Lisi is a prominent proponent of so-called "outside the box" research, which explores scientific inquiry beyond established patterns of thought and methods and pursues unconventional, innovative approaches. Such research can contribute to gaining new insights and making advances in science that would not be possible through conventional methods. However, it also comes with a high risk of failure.

The E8 theory is based on a mathematical object derived from an extremely complex symmetric geometric structure consisting of 248 dimensions, which was decrypted in 2007 after five years of intensive research. Since mathematics has often come to the aid of physics, Garrett Lisi postulates that all fundamental particles and forces of nature can be described as different patterns in the E8 group.

In his E8 theory, Garrett Lisi has emphasized that he considered aesthetic considerations in the development of the theory. Lisi is an avid surfer and believes that the beauty and elegance of the natural world are expressed in its structure and symmetry.

In the E8 theory, the beauty of nature is embodied by the structure of the E8 group, which as a mathematical object exhibits remarkable symmetry and elegance. This symmetry and beauty have inspired Lisi to choose the E8 group as the starting point for his Theory of Everything