'X' are a class of educational robots designed originally in the late 1940s (largely under the auspices of researcher William Grey Walter) and used in computer science and mechanical engineering training. These devices are traditionally built low to the ground with a roughly hemispheric (sometimes transparent) shell and a power train capable of a very small turning radius. The robots are often equipped with sensor devices which aid in avoiding obstacles and, if the robot is sufficiently sophisticated, allow it some perception of its environment. 'X' robots are commercially available and are common projects for robotics hobbyists. 'X' robots are closely associated with the work of Seymour Papert and are commonly used in 'Y' in computer education.
'X' and 'Y'?
'X'-Turtle,'Y'-Logo
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