When explaining the 'trilogy', Lurhmann addresses the first theme that runs through them - it in fact relates not to any social or aesthetic theme, but the inspiration to elements of their storylines.
"The 'Red Curtain' style that defines our filmmaking comprises several
distinct storytelling choices. A simple, even naïve story based on a
primary myth is set in a heightened or created world that is at once
familiar yet exotic, distant. Each of the 'Red Curtain' trilogy has a device
which awakens the audience to the experience and the storyteller's presence,
encouraging them to be constantly aware that they are in fact watching a
film. In 'Strictly Ballroom' dance is the device, the actors literally dance out
the scenes. In 'Romeo+Juliet' it is Shakespeare's heightened 400-year-old
language. In 'Moulin Rouge', our ultimate 'Red Curtain' gesture, music and
song is the device that releases us from a naturalistic world."
(Baz Lurhmann - www.clubmoulinrouge.com)
The primary myths that Luhrmann alludes to are actually easy to understand once brought to light. In Strictly Ballroom, the myth is David and Goliath, along with a second theme of the 'Ugly Duckling'. Romeo+Juliet contains the fanciful myth of youthful love in conflict with society. The