A magic eye

The world observed through this magical eye resembles an image in the kaleidoscope, but it is not an image of colourful beads reflected from mirrors, like it was there, but the view outside the window multiplied and divided 20 times.

The magic eye resembles a plane-convex lens , but its convex surface is not spherical, and has a shape of a 'rosette' from gothic temple - an array of radiating polished plates with a little circular centre, as if it were a bunch of glass prisms. Each of those prisms deflects the light beams in the direction of the observer's pupil. We see a whole rosette of virtual images, set in a circle around the 'real' image.

The magic eye is similar to an insect eye. The eye of a fly is like a rosette; tens of little eyes on the surface of a spherical cap. Do you think a fly sees tenfold?