योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-63, verse-7

यथा स्वप्नस्तथैवेदं जाग्रदग्रे व्यवस्थितम् ।
आकाशमप्यनाकाशं यथैवेदं तथैव तत् ॥ ७ ॥

yathā svapnastathaivedaṃ jāgradagre vyavasthitam ,
ākāśamapyanākāśaṃ yathaivedaṃ tathaiva tat 7

7. Like the appearance of dreams in a sleep, doth this world appear before us in our waking state; so the invisible vacuum appears as the visible (sky to our eye). So the form of the dame was a shape of the intellect.