pool shadow map

as a kid, I loved the water and spent a significant portion of my early years partially submerged in the family pool. i remember closing my eyes, going underwater, curling up into a ball, and spinning myself on various axis', after 15 seconds or so i'd stop, and try to orient myself back to the original position I started in. Lucky for me, I did this back in the early 80s, eluding the satellite's that today would have captured a bizarre floating kid in pool photo and made me famous(?) for 15 minutes on some distant website that tracks down satellite imagery oddities.

Anyway, what we have here is a screen enclosure casting a street map like shadow into the always mesmerizing pool.