The Mediator
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Applications do not manipulate hardware directly — they ask the operating system to act on their behalf, and the OS mediates every program's access to processor, memory, storage, network, and devices.
Show
A ticket app requesting the camera goes through the referee, never around it.
Watch for
The asking is the architecture.