It seems every lighting device extant from the house - from small lanterns and headlamps, LED flashlights to glow sticks and tea lamps - had somehow ended up outside.
Here's the view the next day:
As I understand it, this is a fort, as evidenced by the clear area in the middle. A circular ring of sticks and smooth stones - the significance of which was carefully explained to me - delineates the perimeter, and a welcome mat/sidewalk of twigs can be seen in the lower right, leading to the threshold/entrance. Leaves have been scattered within the perimeter as decoration.
Sienna was just happy to be soaking up some sunshine.
Now, while this may not look to be a heavily fortified area, it must have had some special powers, as we were able to sleep most peacefully, undisturbed, about 25 feet away on the deck - under the stars - that night.