Photography has the amazing ability to caputre a moment in time. Two photographs, then, can capture two minutes and the interplay between the two can be really striking. That’s what we’re looking to explore with this month’s challenge.

Michael Marten illustrates the effect of high and low tide in side-by-side diptychs. Show us your best before-and-after diptych (of any subject) by September 1st and you could win $100 and your photo in the magazine.