The objective of this work was to design an interactive multimedia experience in space, to build a procedure that allows creating these experiences, understanding the roles of different disciplines involved. A multimedia instrument was designed to translate the movements of the hands, into melodies and animations, using ultrasound sensors. Four steps were found: Inquiry, creation, development and evaluation that involved several graphic designers, a musician, a programmer and an electronic engineer. Interactive experience design is a spiral and interdisciplinary process.