Small and big are probably an illusion. A dwarf is no less of a person than a regular sized human. Yet, they have smaller brains. Absolute size doesn't seem to matter. However, we know that both brains are made of perfectly equally sized atoms. You can't get to 'scale independent brains' considering this fact. This 'multi-nature' of nature where the details tell one story while the big picture tells another is either an inherent feature of reality or human cognition.