People born blind have capabilities to create visuo-spatial images. In a range of studies on visual imagery of blind vs. sighted people, congenitally blind persons showed only slight differences in performance. They did not perform worse than sighted persons in tasks involving pictorial and spatial representations of two-dimensional matrices, only in three-dimensional ones. Their dreams are vivid and self-engaging. Visualisation seems to be possible without previous experience (Bértolo, 2005).
"Touchable Memories" is a project that helps the blind to physically re-experience visual memories. Images are reproduced on the basis of 3D sculptures or reliefs.
Bértolo, H. (2005) Visual imagery without visual perception? Psicológica, 26, 173-188.