וַיֵּ֣לֶךְ הָאִ֔ישׁ אֶ֖רֶץ הַחִתִּ֑ים וַיִּ֣בֶן עִ֗יר וַיִּקְרָ֤א שְׁמָהּ֙ ל֔וּז ה֣וּא שְׁמָ֔הּ עַ֖ד הַיּ֥וֹם הַזֶּֽה׃ (פ)
Celui-ci se retira au pays des Héthéens; il bâtit une ville qu’il nomma Louz, et ce nom lui est resté jusqu’aujourd’hui.
Akeidat Yitzchak
That concept was taught to Jacob in the dream via the vision of the ladder. Another way of expressing the lesson is this: Only after mastery of the lessons of ma-aseh bereshit, the workings of the physical universe, can one hope to gain insights into ma-asseh merkavah, the workings of celestial relationships.