  We propose a new technique to help users to explore geometric shapes without
vision. This technique is based on a guidance using directional cues with a pin
array. This is an alternative to the usual technique that consists of raising
the pins corresponding to dark pixels around the cursor. In this paper we
compare the exploration of geometric shapes with our new technique in unimanual
and bimanual conditions. The users made fewer errors in unimanual condition
than in bimanual condition. However they did not explore the shapes more
quickly and there was no difference in confidence in their answer.
