Ten miraculous objects were created in the final moments before the first Shabbat (the Sabbath), squeezed into existence during the twilight of the sixth day of Creation. The Mekhilta DeRabbi Yishmael, a 3rd-century CE halakhic midrash (rabbinic interpretive commentary), preserves this extraordinary list of things God made at the very last possible instant — too wondrous for the natural order, too necessary to leave out.
The list reads like an inventory of the impossible: the rainbow, which would later serve as God's covenant sign to Noah. The manna, the heavenly bread that would feed Israel for forty years in the desert. The staff of Moses, with which all the great signs and plagues would be performed. The writing — meaning the very form of the Hebrew letters carved into the stone tablets. The Shamir (שמיר), a miraculous worm that could cut through the hardest stone without any tool touching it, later used by King Solomon to build the Temple without metal instruments.
The list continues: the tablets themselves, the two slabs of stone on which the Ten Commandments were inscribed. The opening of the earth's mouth, which would one day swallow Korah and his rebels. The opening of the mouth of Bilaam's donkey, which would speak to rebuke the prophet. The grave of Moses, hidden from all humanity to this day. And the cave where both Moses and Elijah stood in the presence of God.
Some authorities add more items: the luminous garments of Adam and the staff of Aaron, complete with its miraculous almonds and blossoms. Each of these objects broke the laws of nature — and God built them into creation itself, right before He rested.