A digital twin is "another me" that gathers my body's data and calculates my future health in advance. But calculation alone does not change the body.
So I complete the loop: measure (collect data) → predict (AI forecasting) → act (real recovery with GRBM) → learn (measure the changed body again and adjust it to me). This loop continuing for life is HOLON. Without an execution layer the loop stops at measurement and prediction. That is why GRBM is essential to completing HOLON.
HOLON sees each customer not as a mere consumer but as a Holon: an independent individual who is at the same time part of a family, a society, an ecosystem and a data network.