This is Siobhan with a tenori-on, downstairs at Phonica.
Apparently all 6 copies in the house were sold straight away. £600! The demo was fun although at a certain point all technical facts flew over our heads.
Toshio Iwai showed some of his earlier projects. Unsurprisingly, tenori-on is inspired by music boxes. Here's an electronic one he developed, from '95(ish)