Physics and Illusions

I'm working on a track based on an idea I had: If I build a downward track made of widely-spaced tubing, and connect that to an upward track made of closely-spaced tubing, the ball should spin faster on the downward track than on the upward track. The result of this, if all goes as planned, is an illusion where the ball actually appears to speed up as it travels uphill. Early tests have been somewhat successful, though the effect is not as noticeable as I had first hoped, but I will keep tweaking the design.