Animation & Sequential Art Principles for Handheld Projector Interaction (PDF 563K). The abstract is as follows:

We present a brief history of historic handheld projection devices and introduce design techniques for handheld projector interaction that draw from the principles of traditional animation and sequential art. Our approach is to utilize the movement of the handheld projector to express the motion and physicality of projected foreground objects. Users interact and control the projected image by moving and gesturing with the handheld projector itself. The overall interaction metaphor, MotionBeam, is applicable in a wide range of scenarios ranging from the behavior of interface elements to interaction with game characters.

12Pixels: Exploring Social Drawing on Mobile Phones (PDF 1.2M). The abstract is as follows:

In this paper we present the design and development of 12Pixels, a novel interface, application, and social web service that allows people to create and share drawings directly from a regular mobile phone. We detail the release of 12Pixels as a service in Japan and analyze trends that emerged from user data collected. Our analysis and insights provide useful ground-level experiences with social drawing and mobile content creation.

MotionBeam: Designing for Movement with Handheld Projectors (PDF 216k) / Poster (PDF 244k). The abstract is as follows:

In this paper we present a novel interaction metaphor for handheld projectors we label MotionBeam. We detail a number of interaction techniques that utilize the physical movement of a handheld projector to better express the motion and physicality of projected objects. Finally we present the first iteration of a projected character design that uses the MotionBeam metaphor for user interaction.

Spatial Sketch: Bridging Between Movement & Fabrication (PDF 500k) - A paper presented at the 2010 Tangible, Embedded and Embodied Interaction conference in Cambridge, MA. The abstract is as follows:

Spatial Sketch is a three-dimensional (3D) sketch application that bridges between physical movement and the fabrication of objects in the real world via cut planar materials. This paper explores the rationale and details behind the development of the Spatial Sketch application, and presents our observations from user testing and a hands-on lamp shade design workshop. Finally we reflect upon the relevance of embodied forms of human computer interaction for use in digital fabrication.

This project was developed as part of the Igarashi Design Interface Project, together with Juncong Lin.