On a similar but different subject...When I first saw the big facial picture of a Dwarf with a shaven head covered with tattoos in the D20 D&D book, I had the idea of a Dwarven spell caster who didn’t use a spell book but instead had all his spells tattooed on him.
His first spells when apprenticing were put on for him on places he couldn’t see or reach, his head, his back, the backs of his thighs, the backs of his upper arms, etc. That left him more than enough space to do his own for spells learned now.
He still had the limitation of having to meditate on his spells to keep them current. It was just a book that could never be taken away or destroyed....unless he got cut up or scarred.