Aesthetic properties
like balance and ugliness, may be mind independent. There's lots to read about aesthetic realism. I cannot google anything specifically on realism about form, but
A widespread answer says that aesthetic properties supervene on formal properties... “lines and colours combined in a particular way”
(I take that to also mean words combined according to e.g. their sounds - you'd call cubism a movement rather than a form, I think).
If ugliness existsis mind independentlyindependent then presumbalypresumably it cannot supervene on something entirelythat exists mind dependently (nothing can depend on the existence of something that exists only dependent on minds, without also depending on minds): aesthetic realists should be realists about form (though aesthetic realism itself faces a similar challenge from the mind dependence of appearances).