4.013 And if we delve into the essence of this imagery then we see that it is not disturbed by apparent irregularities (like the use of # and Ь in musical notation).

Because even these irregularities picture what they are meant to express; only in another way.

(Sharp and flat are what I mean to indicate here, of course.)

What matters is not how a notation or language looks, but how its signs function.

‘Pictoriality’ is suggested by Black (p. 163) for Bildhaftigkeit. Ogden has ‘pictorial nature,’ P&McG have ‘pictorial character.’ I use ‘imagery’ because that is how Wittgenstein translated the same word in 4.015.