Drat, it is really raining hard and the cover is on so I can't take a picture. Having mentally blocked out various angles for pictures I almost believed that I had taken some already and had to double check.

From 75 feet of ribbed black vinyl runners I joined segments and cut them to shape. While the pool was filling I had little time to make a stencil of a giant keyboard and spray paint the 8 octaves. From the stairs the piano looks in proportion but from the side it is exteremely elongated like a stretch limo.

Any shape will do such as dolphin, killer whales or a passenger liner. Most solar pool heaters are external and involve a pump and hoses. I just cut out the middle man and have the sun heat the black mats underwater. The sost savings is about 80% compared to buying an external solar collector. The space savings is 100%.

Another invention I did decades ago was to install underwater speakers in a waterbed. It was vibraciously delicious. Currently I put speakers inside the hot tub cabinate. If you submerge your ears the sound is 4 times louder under underwater - especially the bass - while the cabinate itself acts like giant subwoofer in the immediate vicinity of the hot tub.
The treble is compensated with a set of four large flower pots on legs that have speakers that point straight down. The sound can be angled with flat rocks beneath the pots. The result is a full dynamic sound that while powerful does not disturb the neighbors since the sound dissipates upwards so that 50 feet away the sound
is nearly inaudible.