The Concertina, a Simple Idea

Dean Cayman first got the idea that would become the segue when he watched a man in a wheelchair struggle to get over a step into an ice cream shop. He wondered, could he make a wheelchair that would climb upstairs? It seemed to Cayman that you'd want a device that could regain stability when it was knocked off balance. The engineers at his medical device company set about mimicking the human ability to stay upright while moving. They made a device with a gyroscope that acts like your inner ear, a computer that actslike your brain and wheels that act like your feet. But after years of research they couldn't find a market for their product. So one engineer started making