"And the heavens and the earth were finished" (Genesis 2:1). This is like a bath that was full of water and had within it two beautiful ornaments. As long as it was full of water, the work of the ornaments was not visible; once one opens it and shakes the water out of it, the work of the ornaments becomes visible. So too, as long as there was formlessness and void in the world, the work of the heavens and the earth was not visible; after the formlessness and void were uprooted, the work of the heavens and the earth became visible and they were made into finished vessels.
Heaven and Earth Revealed When the Chaos Drained Away
Yalkut Shimoni on Torah 16:13
(בראשית ב א) וַיְכֻלּוּ הַשָּׁמַיִם וְהָאָרֶץ, לְאַמְבָּטִי שֶׁהָיְתָה מְלֵאָה מַיִם וְהָיוּ בָּהּ שְׁנֵי דִּיסְקְסִים נָאִים, כָּל זְמַן שֶׁהָיְתָה מְלֵאָה מַיִם לֹא הָיְתָה מְלֶאכֶת דִּיסְקְסִים נִרְאֵית, כֵּיוָן שֶׁפּוֹתְקָהּ וְנִעֵר הַמַּיִם מִתּוֹכָהּ נִרְאֵית מְלֶאכֶת דִּיסְקְסִים. כָּךְ כָּל זְמַן שֶׁהָיָה תֹּהוּ וָבֹהוּ בָּעוֹלָם, לֹא הָיְתָה מְלֶאכֶת שָׁמַיִם וָאָרֶץ נִרְאֵית, לְאַחַר שֶׁנֶּעֱקַר תֹּהוּ וָבֹהוּ נִרְאֵית מְלֶאכֶת שָׁמַיִם וָאָרֶץ וְנַעֲשׂוּ כֵּלִים.