Portrait of a Trio with Curtain and Shadows, Wonderfully Ghostly Antique Real Photo Postcard

Spooky! Honestly, it is a bit hard to tell here how much of the eeriness is native to the photo, product of age, or otherwise, but there is no evident staining visible on the reverse so it seems the haunting has come from within! Photos give a good sense--feels like the presence of spirits enveloping them from all sides, and with a window upper right, through which they might have entered! 

5 3/8" x 3 3/8". As found. Used rppc, with handwritten message on reverse, mailed to Clarington, Ohio, postmark 1908 I believe.