2. Unit Motion

Rotation of an arm realizes the pair-wise step motion. The moving unit releases the connection with lower units, and is then carried to a different position where it is reconnected.
Rigid connection is realized by sliding cuffs so that one unit can lift another against gravity. (See the animation of the experiment in the top page).

< Basic Unit motion. After releasing the connection to the underlying unit, Thered unit moves to another position on the horizontal plane when theblue unit rotates around its vertical axis by 90 degrees. >

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