The HomeBox: a web content creation tool for the developing world. - Ben Piper; Rebeca Eun Young Hwang (CHI Extended Abstracts, 2001)

PegBlocks: a learning aid for the elementary classroom. - Ben Piper; Hiroshi Ishii 001 (CHI Extended Abstracts, 2002)

Illuminating clay: a 3-D tangible interface for landscape analysis. - Ben Piper; Carlo Ratti; Hiroshi Ishii 001 (CHI, 2002)

Augmented Urban Planning Workbench: Overlaying Drawings, Physical Models and Digital Simulation. - Hiroshi Ishii 001; Eran Ben-Joseph; John Underkoffler; Luke Yeung; Dan Chak; Zahra Kanji; Ben Piper (ISMAR, 2002)

PHOXEL-SPACE: an interface for exploring volumetric data with physical voxels. - Carlo Ratti; Yao Wang; Ben Piper; Hiroshi Ishii 001; Assaf Biderman (Conference on Designing Interactive Systems, 2004)

Tangible User Interfaces (TUIs): A Novel Paradigm for GIS. - Carlo Ratti; Yao Wang; Hiroshi Ishii 001; Ben Piper; Dennis Frenchman (Trans. GIS, 2004)