They're these special wheels that can move equally easily in all directions, and when you couple these robots with a video projector, you have these physical tools for interacting with digital information.
这些轮子很特别 可以很容易的往任何方向移动， 当你用投影仪与 这些机器人相配合的时候， 你就拥有了这些物理的工具 与数码信息相互动。