This shot was taken during "Reflections" show by 59 Productions celebrating the XX anniversary of the Guggenheim museum in Bilbao.
I had to use several techniques, mostly to keep the highlights in control and not to burn them. First high ISO with fast shutter speed was necessary to freeze the videomapping lights proyected on the fachade, and second, low ISO and long exposure to get the most of the picture free of noise. The sky was replaced by one taken an hour ago during the late blue hour. Finally blend it all together.
What a light show!