Quote from Designboom.com about the project:
LED lighting within the swings are regulated by custom micro-controllers that signal their activity levels. this happens thanks to the internal accelerometer that measures the forces of the swing. this means when they are static, they emit a soft, white light and a switching one from white to purple when in motion. these responsive play elements invite users to interact with each other and create more of a community at the Boston park.
Watch the short video to see the dazzling design and colours in action.
Full article can be found on DesignBoom here: http://www.designboom.com/design/howeler-yoon-architecture-swing-time-09-12-2014/