May 2, 1937: A nice day for a portrait on the lawn

This is a nicely framed snapshot, for which the only available information, written on the back, is "May 2, 1937."

In a minor trick-of-the-eye, note the pile of rocks to the right of the women. The cracks between the rocks, at first glance, look like they could be extensions of the tree branches above them (and further in the background).

Here's a closer look at the two women...

For historical context, this photograph was taken four days before the LZ 129 Hindenburg burst into flames in Lakehurst, New Jersey.