According to Langone’s The Mystery of Time, humanity has been recording time for about 30,000 years. It is hypothesized that Ice Age European hunters began digging lines and holes in bones according to the moon’s phases in order to mark the passage of days. Since then, humanity has devised more complex and accurate forms of timekeeping through technology. Precise durations

such as the minute and second have been incorporated into devices which people carry with them everyday. These recording methods have enabled people to track events such as birthdays,

holidays, and anniversaries. Human history has been tracked in books according to these methods.

All of this is evidence of humanity’s interest in using mark-making systems to record moments and deem them significant.

In his body of work entitled Experiential Extensions, Johnston marks moments of his existence through complex, aesthetic means. First, he takes photographs of curious shapes that he sees in his surrounding environment while going on walks. Then, he highlights these areas using image editing software. You can see a series of these photographs and highlighted regions below.

Photographs from the Looking At Clouds Series, taken on May 3, 2006