The Vedanta Sutras of Badarayana, Commentary by Sankara (SBE38), tr. by George Thibaut [1896] at sacred-texts.com

15. And as light (assumes forms as it were by its contact with things possessing form, so does Brahman;) since (the texts ascribing form to Brahman) are not devoid of meaning.

Just as the light of the sun or the moon after having passed through space enters into contact with a finger or some other limiting adjunct, and, according as the latter is straight or bent, itself becomes straight or bent as it were; so Brahman also assumes, as it were, the form of the earth and the other limiting adjuncts with which it enters into connexion. Hence there is no reason why certain texts should not teach, with a view to meditative worship, that Brahman has that and that form. We thus escape the conclusion that those Vedic passages which ascribe form to Brahman are devoid of sense; a conclusion altogether unacceptable since all parts of the Veda are equally authoritative, and hence must all be assumed to have a meaning.--But does this not imply a contradiction of the tenet maintained above, viz. that Brahman does not possess double characteristics although it is connected with limiting adjuncts?--By no means, we reply. What is merely due to a limiting adjunct cannot constitute an attribute of a substance, and the limiting adjuncts are, moreover, presented by Nescience only. That the primeval natural Nescience leaves room for all practical life and activity--whether ordinary or based on the Veda--we have explained more than once.