Rasmus Hildonen and Skomakerstuen created a beautiful LED installation at the Horten Lighthouse in Norway.

The installation features over 3,000 WS2812b LEDs in 16 windows.  The LEDs react to an ultrasonic distance sensor (HRXL-MaxSonar-WR) under the pier that is used to measure tides and wave heights.  A Teensy 3.2 and a OCTO28 Adapter along with the FastLED Library are used to control the LEDs.

This video shows some of the behind the scenes work.

There is some additional discussion about the project here and here.