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"Each rifle barrel is different in minute detail and leaves distinct striation marks on the soft lead of a bullet head as it passes down the barrel," Mr Woods said.

There are different striations of that, but can you speak about the role of those male figures in Aaron's life as they relate to his own construction of masculinity?

Later they hiked Mosaic Canyon, where mud flows and flung stones have raised and rearranged the canyon floor, scraping and polishing walls that were always famed for their striations and markings.

The Havasupai people, for example, say the condor flew their ancestors from the bottom of the Grand Canyon to the top — its wings creating the famous striations.

The sun sank behind the ridge, and we inched the tripod around until all the striations on the rock lined up with Adams’s picture.