The last photo gives a overview of the set-up. In the centre stands the small vertical tube with the marbles. Something to the right is my hand. I’ve just pulled the nail out of the tube so the marbles fall down. The gray brace is the light curtain wheretrough the marbles fall down and give a signal to the timermodule. At the upper left side you can see the vivitar 283 flash with above a manual button for the brightness and also the remote control to the timermodule. The photo also shows a good shot. At the bottom you can see a black box with the soap bubble and around some extra pictures used for the reflections. These reflections are causing the beautiful colours. At the left side is my bottle with the liquid to make the soap bubbles.