Howard Boland By box, currently showing António Caramelo's Dreaming of a Butterfly.
Howard Boland Looking at one of the challenging aspects of the work - feedback loop vs. sensitivity of the butterflies.
As the butterflies sensitivity grew.....so did the crowds.
"Are they real?" - the main question posed by many of the passers-by.
Locating alternative spots for microphones was tricky.
Howard Boland Listening out for box humming.
Audience pondering by the artwork.
Reality as an investigatory process? Many had figured that clapping was the easiest way of causing motion - at some point a large group could be seen clapping around the box.
The box and its proximity to one of London's famous landmark - "the gherkin".
A chilly autumn evening with the butterflies.