[ACM Press the 2007 conference of the computer-human interaction special interest group (CHISIG) of Australia - Adelaide, Australia (2007.11.28-2007.11.30)] Proceedings of the 2007 conference of the computer-human interaction special interest group (CHISIG) of Australia on Computer-human interaction: design: activities, artifacts and environments - OZCHI '07 - Picture navigation using an ambient display and implicit interactions