I have no idea what it is, but I want it.

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According to Sharewear, these are electronic dresses “that physically slot together to activate atmospheric pools of light”. These lights aren’t only above the head, but also in hidden compartments in the skirt, thus making it possible during a performance to play with them and to create different shadows.
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The dresses are the work of Di Mainstone and the V2_ team.

(source: joshspear.com)