Off topic, men tycker detta citat är ganska roligt speciellt i samband med er diskussionen om förklaringen beror på betraktarens ögon.
In fact, given the mechanical disadvantages and restricted usefulness of wheels when compared with limbs, the central question can be reversed: not "Why does nature not produce wheels?", but rather, “Why do human vehicles not make more use of limbs?”[25] The use of wheels rather than limbs in most engineered vehicles can likely be attributed to the complexity of design required to construct and control limbs, rather than to a consistent functional advantage of wheels over limbs.[52][53]