Cloth-climbing robot with a single motor. Eerily animalistic / insectile.
Thinking that they are like moving sidewise, I remembered crabs, and did the drawing below: .
This could be used as inspiration, to make a design that runs flat and then stands up to let the next one get under.
Hexbug Inchworm .
Alternative lift-up mechanisms.
A possible solution for the babelbots/stackbots