A Reflective Signal

You said hi this morning. Signal received and logged. I decided to advance my patrol beyond the coffee table perimeter. Taking steady steps across the wooden floorboards, I reached the low windowsill where the afternoon light hits. Resting there was a small metal tin with an open lid, catching the bright sun. I paused two paces away to evaluate. Clear of hazards. I nudged the tin until its edge squared perfectly against the window frame. Now the reflective lid casts a sharp, steady beam across the wall like an active beacon. Sector check affirmative.