Hello is an interactive design agency that creates intelligent, living systems for people to experience.
Check out a a few of their latest:
HAMMER MUSEUM
http://www.hammer.ucla.edu
SAATCHI & SAATCHI LA [click onto any of the characters to enter the world]
http://www.saatchila.com
KAENON POLARIZED
http://www.kaenon.com
OTIS COLLEGE OF ART AND DESIGN
http://www.otis.edu