Figure 1
Swell paper image of J.M.W. Turner’s painting of Oxford High Street with the spatial co-ordinates captured by the TouchTracker application mapped on to it.
Figure 2
A 3-dimensional view of the TouchTracker data showing the X and Y co-ordinates and the pressure applied to them. The data come from one test session with one person. The circle indicates a co-ordinate where extra pressure is applied.