The city of Liverpool, famously known as both the home port of the Titanic and the birthplace of The Beatles, also seems to have a thing for interactive public art installations. Witness this huge interactive Christmas tree that can be played by passersby.

The display in the city’s busy Williamson Square was commissioned by a municipal business group and built by [Adrian McEwen]. The idea was to adorn the 0-meter natural tree with large geometric ornaments covered with Neopixel strips. [Adrian] documents the build process in some detail, including that fact that over 10 meters of WS2812b strips went into the ornaments for the tree. While the strips themselves at IP68 rated, the connections needed when attaching them to the custom-made frames were not, and that had to be overcome with ample application of heat-shrink tubing. OctoWS28 adapter boards were dangled about the tree to control the lights and together with garlands of Ethernet cables. Pressure sensors were used to control the lights when the EMI from the beefy power supplies needed to run everything proved too much for the original touch sensors. After a lot of bench testing and a few long nights working with the city crew to hang the display, passing Liverpudlians can now play the tree and enjoy the Christmas season.

Would you rather a smaller display for your own Christmas tree? This somewhat hyperactive indoor light show might be what you’re looking for.

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