“…it is impossible to make these building matters understandable if one doesn’t see them drawn out, and even in a drawing it is difficult to take in.  And no one can understand [building] if he can’t interpret [drawings], so that it takes more effort to interpret a drawing than to make one.  This may seem unreasonable [but it is so] since many people will draw for exercise without really knowing what they are doing.” – – Filarete [c. 1400 – c. 1469], a Florentine Renaissance architect, sculptor and architectural theorist