Here:

Spiral seating arrangement to explore the self in the large group, supported by trained conference consultants. The purpose is to experience group dynamics and to experience the self in the here and now of it all!

And not:

Spiral of silence: The spiral of silence is a political science and mass communication theory propounded by the German political scientist Elisabeth Noelle-Neumann. The theory asserts that a person is less likely to voice an opinion on a topic of morality if one feels that one is in the minority for fear of reprisal or isolation from the majority.

Nor:

Spiraling (Urban Directory): Something totally stupid or out of control