These machines can be very sensitive

I recently had a bit of a scare. After having guests for a party at my house I realized that the marbles were getting stuck on the camel humps in Desktop #4. I carefully inspected the sculpture for any signs of damage and could not find any. After a while I discovered that oil had transferred from the hands of my guests to the marbles and it was causing them to have less traction at the peak of each hill. I cleaned the marbles with a towel and everything began working perfectly again.