Margareta Hesse's No barrier is one of my favourites, and luckily I've had a chance to see it several times, since it seems to be everyone else's favourite as well. The idea is simple: the laser shuts down as soon as something / someone hits it, making the artwork both safe and a metaphor of borders and limits being often quite imaginary (the latter being my interpretation). Seen at Re.Light festival in Regensburg.

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