Several years ago I decided to sidestep the need for large wheelbases by designing and building a tall, skinny and agile robot that balances on, and is propelled by, a single spherical wheel.

• 几年前，为了克服必须加大轮距的问题，我决定以单一球形轮当成支撑脚和推进器，制作高高瘦瘦、动作敏捷的机器人。