that's a tagged bird's nest above my window. today there is a pair of birds that took turns flying in and out of it. they'd perch on my window mullion before flying up to the nest. when i opened the door to take a picture, i spooked them off.
they came back as soon as i went inside. they were cautious; one perched on the sycamore while the other checked out my door at length. here it is, looking like it's ready to take me on should i dare step out again.