Dreaming of a Butterfly
In Smithfield there is this astonishing display of what looks like captive butterflies in jars, fluttering about, until you realise they are mechanical. Looking at the website it appears that they react to the sound around them. Also, unfortunately, they may be gone by now (the website says it closes on 18th Feb) but these things often hang around a little longer. I'm sorry if I am too late with this information.