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In spacecraft design (and these are part of the overall spacecraft design), minimal weight is a goal at every turn. The design of these wheels allow for maximum strength at a minimum weight, as well as allowing them to conform to a wide variety of surface types on Mars. I'm sure that the way they look is the outcome of their functional design, and aesthetics probably are a mere byproduct of the process.
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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