Rocky Roller

ROCKY ROLLER consists of two long and narrow boxes that can be manually tilted along its length or width. There is a ball in each box. Visitors are challenged to roll the ball down the middle of the box by adjusting slopes along its length and width. This exhibit is an example of a feedback system. The position of the ball serves as a feedback to tell the user how to tilt the box. The quickness and accuracy of corrections is critical to success. The importance of this feedback becomes clear when visitors try the box on the right. A delay has been built into the knob on the right, slowing the users responses and making it harder to keep the ball in the middle.