Richard Hills at the Troxy Wurlitzer - Theatreland 

They're the swell indicators - they represent the position of the two main swell shoes (controlled by Richard's right foot) and, therefore, how far open (or closed) the swell shutters are in front of the pipe chambers. The left hand one is for the main chamber(s) and the right is for the solo. These are the primary way - other than registration changes - to control the volume of the Wurlitzer.

Yes, it's not just the technical ability that is dazzling, but rather the imagination in regstration, counter melody and phrasing, orchestration really. He can show off a large instrument so well .

@@johnloud5673 He is also the only organist that has taken on some of the complex works that the late and utterly brilliant orchestrator, William Davies used to perform. His masterpiece was the 'Variations On BBC' - a test piece that was aired in experimental simulcast stereo in 1960 from the Trocadero Elephant & Castle on this very instrument at its last concert before the theatre closed for the very last time. It was aired between VHF 405-line television broadcast on one stereo channel and VHF radio broadcast on the other. The recording was released on an LP many years later. A masterclass in technique, orchestration and playing.