Mozart and Neil Diamond may have begun with the same idea, but that a work of art is more than an idea is confirmed by the difference between the 'Soave sia il vento' and 'Kentucky Woman. ' We have different words for 'art' and 'idea' because they are two different things.
If you have a clear idea of a soul, you will have a clear idea of a form; for it is of the same genus, though a different species.