No erasing. No lifting. No limits. In this extreme drawing test, I take on the ONE LINE ART CHALLENGE — but this time, it’s 3 hours straight with just a pencil and a whole lot of patience.

Joshua Abelow, who uses pencils on soft paper to create large line drawings (that he never revises or erases), says he’s been using Staedtler’s 6B Mars Lumograph pencils exclusively since 2004.

Puzzle 1: Draw this shape without picking up your pencil or redrawing the same stretch of line more than once. This puzzle seems relatively benign. Mess around with it for a bit and you’ll get it.

A scale pen gives you smart line weights for precision drawing. ... Silica, is fast and responsive, and on the iPad Pro with Pencil, drawing or painting on Procreate feels natural.