"Ryoji Ikeda and Carsten Nicolai both work at the cutting-edge of contemporary electronic music and sound art. In 1999, the two artists initiated the joint project cyclo., which is devoted to the visualization of sound. In their shared work, they generate new hybrid forms of audiovisual art and expand the possibilities of digital technology.
The project's first publication is cyclo.id, a book and included CD-ROM that offer a multimedia and interactive documentation of the audiovisual material that Nicolai and Ikeda have collected, researched, and created since they began working together. The featured images are formed by the metering of sound bits that have been selected by the artists with meticulous care according to their acoustic and illustrative potential." - Gestalten. See more;
It's posible to buy cyclo.id at Gestalten
This is a nice video/talk where Carsten Nicolai speak about his work and about another previous good book he made while ago, called Grid Index, the first comprehensive visual lexicon of patterns and grid systems.