Door Note #001
Revolving Glass Door
Source: Institutional flow research
Context: How crowded risk-taking has become and what happens when exits shrink.
What door is this?
This is a revolving glass door.
You can walk in.
You can walk out.
But if everyone pushes at once, it shatters.
Flows are people inside the building. This note shows how crowded the lobby is, not whether the building is safe.
What is happening to the door?
The door is spinning faster, and the crowd is pressing closer together.
Movement looks smooth from the outside. Inside, space is shrinking.
What breaks if this door fails?
Everyone turns at once.
That is when glass doors break. Not from impact, but from pressure.
Where is the exit?
Stay near the edge.
Keep your weight outside.
Move slowly enough that you can step back without forcing others.
Size determines whether this door is reversible.
Action
This PDF is a security camera, not a map. It shows crowd density at the door, not what is behind it.