This is demonstrated in the exhibition's giant model of a City Hall Tower for Philadelphia that was never built, a dramatic double helix derived from the discovery of DNA in 1953.
Third, in terms of the process of reaching national security decisions, I am adopting in total the Tower Report's model of how the NSC process and staff should work.
When the three researchers programmed their model to arrange PS10's mirrors in front of the tower in a segment from such a spiral, they both improved the efficiency of the collection process and saved space.