The Head Center
The centre that generates the pressure to think, which is not the same as thinking.
Defined Head
You produce your own questions and inspiration at a steady rate. The pressure is yours, it is consistent, and you are usually the one handing other people something to think about.
Open or undefined Head
You take in and amplify everyone else's mental pressure. An open Head centre spends a lot of life trying to answer questions that were never yours, and the relief is enormous once you notice that most of them can simply be put down.
The not-self theme: Trying to answer questions that do not actually matter to you, and mistaking that churn for thinking.
What an open Head eventually becomes
An open Head becomes unusually good at telling an interesting question from an urgent one, because it has felt the difference so many times.
This is the part most people miss. An open centre is not a deficiency to be fixed. It is where you take in and amplify other people, which is uncomfortable for years and then becomes the thing you understand better than anyone with it defined.
The gates of the Head
3 of the 64 gates sit in this centre. Each is also a Gene Key, read as a Shadow, a Gift and a Siddhi rather than as a mechanic.
Centres, gates and channels come from the same tables the bodygraph is drawn from. Human Design was assembled in 1987; Six Mirrors reads it beside five older systems and shows where they agree.