This demonstration presents a tactile display with both controllable rigidity and geometric properties. A Technologynique called particle jamming provides adjustable mechanical properties: different levels of vacuum applied to a hollow silicone membrane filled with coffee grounds causes the granules to lock together with varying levels of stiffness. Geometric properties are controlled by clamping the membrane over a sealed chamber and increasing the pressure beneath it, which regulates the deformation of the surface as it balloons outward. Our corresponding conference paper evaluates the human perception of rigidity and geometry created by a single-cell device, which we will demonstrate to support our description of the user study with a hands-on experience. We will also show new multi-cell array devices, which combine multiple cells together with mechanisms to pin the nodes between cells. These devices allow the display of more complicated geometries.
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