To a person with a hammer, everything looks like a nail. The exception to the rule is Swiss artist Simon Berger; while trained as a carpenter, he eventually turned his hammer into more of a paintbrush.
Berger's technique is to precisely strike panes of glass with a hammer, using the resultant spiderwebs as highlights. In this manner, he's able to create some astonishing portraits:
Here's a time lapse of Berger in action:
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I'd bet anything that young artists inspired by Berger ask him "So like, what kind of hammer do you use?"