"For other men, as well as architects, can distinguish the good from the bad; but between the ignorant man and the architect there is this difference, that the first can form no judgement till he sees the thing itself; whereas the architect, having a perfect idea in his mind, can perceive the beauty, convenience and propriety of his design, before it is begun."

Marcus Vitruvius Pollio

'De Architectura', Book VI, 15BC