Artist Dick Elliot has created an incredible public work of art that you can see from your car or get out and examine more closely. The cool thing is you can see it even at night, as it's made out of reflector buttons that light up as autos pass by.
The Sound of Light is a public art piece that enhances the Hudson Wall Of Seattle’s Sound Transit light rail corridor. It is composed of 35 reflector panels attached to the retaining wall. The largest panel is 5’ wide by 20’ tall. It was installed in the fall of 2007 and was recognized by American's for the Arts Recognition for Innovation in Public Art. The piece runs for 2 blocks along Martin Luther King Way on the Seattle Sound Transit Light Rail Corridor between Dawson St. and Hudson St. It can only be seen when driving north.
Here's a photo of Richard Elliot in front of his creation. He passed away in 2008.