Another interpretation: "from a thread" (Genesis 14:23) — this is the Tabernacle, which was woven with blue, purple, scarlet, and fine linen, and so on. "To a shoelace" — this is the thread of red dye [the sikra], for it is taught: he girds it [the altar] in the middle to separate between the upper blood and the lower blood. "To a shoelace" — these are the footfalls [the festival pilgrimages], as you say, "how beautiful are your footsteps in sandals" (Song of Songs 7:2).
Reading the Thread and the Shoelace as the Tabernacle and Its Service
Yalkut Shimoni on Torah 76:2
דָּבָר אַחֵר, אִם מִחוּט זֶה הַמִּשְׁכָּן, שֶׁהָיָה מְצֻיָּר בִּתְכֵלֶת וְאַרְגָּמָן וְתוֹלַעַת שָׁנִי וּבְשֵׁשׁ וְכוּ' וְעַד שְׂרוֹךְ נַעַל זֶה חוּט הַסִּיקְרָא, דְּתָנֵי וְכוּ' חוֹגְרוֹ בְּאֶמְצַע לְהַבְדִּיל בֵּין דָּמִים הָעֶלְיוֹנִים לְדָמִים הַתַּחְתּוֹנִים, וְעַד שְׂרוֹךְ נַעַל אֵלוּ פַּעֲמֵי רַגְלַיִם כְּמָה דְּאַתְּ אָמַר (שיר השירים ז, ב) "מַה יָּפוּ פְעָמַיִךְ בַּנְּעָלִים".