I dug up this rock while hiking the Negev desert in Israel last year. It’s sharp and kinda chalky and it feels like it has stories to tell when you look deep into its lines and layers.
For these Grahams Up the Tree drawings I used a Pilot Custom 823 with FA nib. This pen is legendary. It has a very soft nib and a giant vacuum filled tank of ink so you can write and draw for days.