Charles H. Spurgeon on Psalms 104:2

Like a curtain. With the same case, by his mere word, with which a man spreads out a tent curtain, Ps 104:2 Isa 40:22 is parallel, "that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in." Ver. 3 continues the description of the work of the second day. There lie at bottom, in the first clause, the words of Ge 1:7 "God made the vaulted sky and divided between the waters which are under the vault and the waters which are above the vault." The waters above are the materials with which, or out of which, the structure is reared. To construct out of the movable waters a firm palace, the cloudy heaven, "firm as a molten glass" (Job 37:18), is a magnificent work of divine omnipotence. E.V. Hengstenberg.