The picture shows what happens when you put just one ball in the kaleidoscope corresponding to the symmetry group of a dodecahedron: we see 120 balls, corresponding to the 120 elements of the symmetry group of the dodecahedron.
In this photo the same effect is reached by putting two identical balls in a kaleidoscope, which is the "double" of the kaleidoscope corresponding to the symmetry group of a dodecahedron.
You can see an analogous photo in the same kaleidoscope; or the photo of an analogous situation in a different kaleidoscope.
From the exhibition Simmetria, giochi di specchi - Symmetry, playing with mirrors.
The image belongs to the sections...:
From "mirrors" (From "XlaTangente")
"about the project" (From "XlaTangente")
The symmetry group of the dodecahedron (*532) (Symmetry)
In the red kaleidoscope (dodecahedron) (From the exhibitions of matematita)