> For the complete documentation index, see [llms.txt](https://gitbook.silverdoor.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook.silverdoor.ai/the-spheres.md).

# The Spheres

- [Foundry](https://gitbook.silverdoor.ai/the-spheres/foundry.md): The Foundry is the focus group for partnerships, strategy, entrepreneurship and business development.
- [Operators](https://gitbook.silverdoor.ai/the-spheres/operators.md): The "Operators" are the core of the Silver Door.  We operate equity ventures in collaboration with the Foundry and our partners.
- [Kazoku](https://gitbook.silverdoor.ai/the-spheres/kazoku.md): "Kazoku" is the Japanese word for family.  We are the people people of the Door.