Sticky-Selectors: I used epoxy to cast handles for magnetic button-switches. Connected to the end of conductive pieces of steel cable, each becomes a tangible radio-button. It allows selection of a single option from many, and provides visual feedback by remaining physically connected. They are one of those objects that you can't keep your hands off of - very durable, and could be useful for a museum interface.

update (december 2003): I used the sticky-selector for this installation.