Both Starsylph and ARC-II-J1 has normal wheels for spinners, but Wygar's very different.
Imo-chan calls Starsylph, a "QT-ARMs of the war-era" back in episode 1. Compared to Itsuki's ARC-II-J1, these QT-ARMs look more hi-tech and sleek. The same goes for the colonies themselves, Brain Colonies are much more high tech that what the normal colonies have.
But the interesting thing is that these 'ancient machines' really do look more 'ancient' in design, with decorated armour and gothic architecture. Compared to the normal time, blocky 'modern' design of ICP's QT-ARMs and 'modern' architecture in the colonies
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