The choreography was inspired by a trip on the unique Wuppertal Schwebebahn (pronounced roughly as VOOP-per-tarl SHVAY-ber-BARN).
This is a 13 km long monorail system that mostly runs above the river Wupper.
The little two-coach trains are suspended from A-frame supports, here represented by 1st couple dancing under a series of arches - though the line does not wind nearly as much as is illustrated in bars 7-10.
The service is operated by Wuppertaler Stadtwerke, abbreviated as WSW, hence the W shapes of the double double triangles either side of the S shapes of the reels of three across.