Wall hanging RBS #77, in progress

I am currently working on a wall hanging sculpture that measures 36" high by 24" wide. It has a chain lift that lifts 1-3/8" marbles at the rate of about 5 1/2 per minute. There are three tracks in this RBS. The loop d' loop is split between two different tracks instead of being a single path from top to bottom. Both of the built tracks in the pictures have just one marble on each track. The last track, still to be built, has a ball collector which will tip when it has 4 marbles. That track will be fast and slow, zipping about the sculpture with the marbles in a row. The marbles in a row are fun to watch because sometimes the marbles stay together, sometimes they spread out. It depends on the size of the marbles whether they stay together or not. Check out the pictures to see this sculpture as it comes together.