he said in the interview:
themorningnews.org/archives/galleries/throwing_water/03tw.php

Phase One cam is a still camera, and this video is recorded with High-speed camera, such as phantom...

The sixth commenter posted a link to an article, which will answer your question and more. themorningnews.org/archives/galleries/throwing_water/03tw.php

as I said: phase one is a still camera. people here r interested in video. thank u.

¿Who cares the camera? Maybe a Phantom or a Weisscam or what ever. The thing is about sculptures "I’ve pictured shapes and colors of the liquids in my mind first, and tried to re-create it on the shoot. It is said that a Zen garden represents the minds of high priests who achieved enlightenment."
Creo que se refiere a la Phase one cuando habla de cómo registra las esculturas . Estoy seguro que éste video no es precisamente la obra es sólo un registro.