Commentary for Menachot 64:5

והילכתא תפילין לא בעי שרטוט ומזוזה בעיא שירטוט ואידי ואידי נכתבות שלא מן הכתב מ"ט מיגרס גריסין

is: Tefillin need not be written on ruled lines, the mezuzah must be written on ruled lines, and both may be written from memory. What is the reason? - They are well known by heart. R'Helbo said, I once saw R'Huna when he wished to sit down on a couch upon which lay a scroll of the Law, invert a vessel on the ground, place the scroll upon it, and then sit on the couch.

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