Radial is combination of centralized + linear. Central space with linear arms extending out like star.
Ching says: Radial organization is extroverted. Centralized looks inward to center, radial looks outward from center to context.
Structure: Central hub + radiating arms. Arms can be different lengths, different functions. Hub controls arms.
Examples: Airport - central terminal hub, concourses radiate to gates. Hospital - central nursing station, patient wings radiate. Traditional village - central well or square, streets radiate.
Why powerful: 1- One center controls many directions - efficient. 2- Each arm can have different view/orientation - north arm cool, south arm warm. 3- Dramatic - you stand in center and see all directions.
In Egypt, radial works for resorts - central lobby hub, room wings radiate to sea views, each wing different angle to sea.
Challenge: Center becomes traffic jam if not big enough. All circulation passes through center. So center must be large, with clear wayfinding.
Structure: Radial organization needs radial structure or complex. Often center is circular or polygonal, difficult to build with rectangular materials. Cost higher.
For Instagram: Star diagram - center circle with 5 arms. Label each arm function. Simple diagram gets high saves because architects use radial for many projects but rarely see clear diagram.
Design exercise: Take centralized courtyard house, extend 3 arms: one to street (entrance), one to garden (private), one to view (terrace). Now it's radial, more dynamic.
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