This is a tree in the back yard outside my balcony. When I first moved in here (Nov. 2001) it was only a quarter of its present size. Now it's large enough that, for a brief few fall days, it serves as a "surrogate sun": its leaves turn a bright yellow – so bright, in fact, that I'm often momentarily deluded into thinking it's turned sunny outside, when in fact, I'm seeing only the light reflected from the tree. And on days when it really is sunny out, the wall of my living room opposite the balcony window positively glows yellow.
Alas, both leaves and sun will soon be gone.