Tricky Berlin church puzzle

With it's myriad blue glass panes and ethereal looking organ pipes, this picture of the Kaiser Wilhelm Memorial Church interior makes a tricky little puzzle. The famous church in Berlin was rebuilt after the original church was reduced mostly to rubble in a bombing raid in 1943. The Schuke organ is the major, but only dimly seen, point of interest in the new church as the main effect comes from the surrounding walls of vivid blue, green and red glass.