  Inspired by the role sound and friction play in interactions with everyday
objects, this work aims to identify some of the ways in which kinetic surface
friction rendering can complement interactive sonification controlled by
movable objects. In order to do this, a tactile system is presented which
implements a movable physical object with programmable friction. Important
aspects of this system include the capacity to display high-resolution kinetic
friction patterns, the ability to algorithmically define interactions directly
in terms of physical units, and the complete integration of audio and tactile
synthesis.
  A prototype interaction spatially mapping arbitrary 1D signal data on a
surface and directly converting these to sound and friction during movements
across the surface is described. The results of a pilot evaluation of this
interaction indicate how kinetic surface friction rendering can be a means for
giving dynamically created virtual objects for sonification a tangible
presence. Some specific possible roles for movement input and friction output
are identified, as well as issues to be considered when applying and further
developing this type of haptic feedback in the context of interactive
sonification.
