Sketch models are a great way to show three dimensional ideas.

The sketch models below show circulation and what that looks like when it is cut off.

model_01

Model 01 shows circulation that has been cut off and stacked.

model_04

Model 02 shows a section cut of disconnected circulation.

model_02

Model 03 represents different paths that converge into one area.

model_05

Model 04 represents the stacking effect with circulation being cut off and connecting depending on placement.

model_06

Model 05 represents contained circulation and the redirection of flow.