Rashi quotes a Midrash or Aggadah about how Korach belittled Mosheh Rabbenu using
1 the Tallit shekulo T'echeilet
2 the room filled with Sifrei Torah
Korah makes Moshe's reasoning seem silly to require one more thread of T'cheilet for the Tallit - And to require 2 more Parshiyot for the room already filled with Sifrei Torah
While the story reads fine as is - many may notice the underlying symbolism and others may tend to overlook it.
The point of Korach's rebellion was madua titnas'u on K'hal Hashem? Meaning he advocated anarchy in order to dispose of the leadership whom he grew to resent due to the appointment of Elizaphan ben Uziel as per Hazal
Thus, the M'zuzah and the P'til T'cheilet are symbolic that EVEN a fully holy garment or room STILL needs a special symbolic "leader". And so, too, a K'hal Hashem - no matter how holy - needed a specific "p'til t'cheileit" or a "m'zuzah" anyway, in this case Moshe and Aharon.
This "chap" is not originally mine, but it is imho the key to reading between the lines of this Midrash for a further tremendous psychological insight of WHY Korach davqa picked these items to underscore his K'tatah.