This is our doctrine, Brutus, that we do not really 
feel or see everything, but perception by the senses
is a pliant and deceitful thing, and besides, the 
intelligence is very keen to change and transform 
the thing perceived into any and every shape from one 
which has no real existence. An impression on the 
senses is like wax, and the soul of man, in which 
the plastic material and the plastic power alike exist, 
can very easily shape and embellish it at pleasure.