first presented at dhc/art in montreal in 2012, ryoji ikeda's exhibition systematics is currently held at gallery koyanagi in tokyo. ikeda is renowned as an electronic composer and visual artist who investigates sound, time and space based on mathematical methods. on display are a series of rather nifty light boxes formed from punch cards of the earliest computers and the rolls used in automated pianos, exhibited as if they were archaeological artifacts. similar to the presentation in canada, the show also includes a reinterpretation of the datamatics series from 2006, converting mass data into colour and monochrome microfilm, and again transformed into a light box which acts as an archive for a vast set of information [on through dec 21]. location: koyanagi building, 1-7-5 ginza [ginza].