We tried this out on a large scale at the De La Warr Pavilion show. The audience could make the line bulge and become pregnant with spiders eggs, which burst forth after a while.

It was a forward projection over 4m with people creating silhouettes which were picked up by a webcam. The webcam was mainly interested in the silhouette's horizontal position (not height) so even children would set the line off if they reached up.

The interaction was our most intuitive yet, because the audience could see that their shadow was affecting the line instantly. People spent a long time playing with the undulating line. In fact the interaction was so successful that we will probably split Growth Line into two separate pieces: the bulging line and the spider eggs, which although fairly repugnant were dwarfed at this scale.

We were asked to adapt this work to fit a narrow entry space in a gothic church in Vauxhall as part of the Joy Of Sound's amazing Sensorium festival. The organiser William Longden, said it would be a dream come true if we could add an interactive experience to this celebration of inclusive arts, dance and music.

There is a video of some kids going crazy in the space on the VIDEO PAGE.