3-D Effect

In the Polka Dot number toward the end, female dancers - dressed almost completely in skin-tight blue - hold and swing pink rings circles. The set is semi-dark.

To me, the pink and blue contrast gave a 3-dimensional effect to the dancers and their hoops against the dark background that was almost unbelievable.

Did anyone else notice that? It's only visible for about 10-15 seconds. Berkeley could easily have created that effect.