This was Stu's Challenge:
This week, the subject is absent from the frame. This could be for various reasons - location: your subject is present but off to one side of the frame; temporal: your subject was present but has now gone.
There should be sufficient clues in the frame that the viewer will have at least some idea about the subject, even if they don’t know its exact nature. Use shadows, gestures, lingering artefacts… whatever you can to give away as much as you can about your subject without showing it.