The eraser makes revision part of the tool instead of evidence against the artist.

Building correction into the equipment changes what a mistake means. If the pencil arrives with a way of undoing itself, a wrong line becomes a stage rather than a verdict, and the hand relaxes enough to try. Most people are not short of ability so much as short of permission to be wrong on the way. Tools quietly teach an attitude, and this one teaches that first attempts are drafts.

Give whatever you are working on an obvious way to be changed: a draft copy, a pencil version, a clearly labelled first go. Then let yourself do it badly once on purpose.