/* Double wrapped fisheye */
camera {
   fisheye 
   angle 720
}

/* Single white light source just next to the camera */
light_source {
   x/4 
   rgb 1
}

/* Cayley surface */
isosurface {
   function { 5*(x*x*y+x*x*z+y*y*x+y*y*z+z*z*y+z*z*x)-2*(x*y+x*z+y*z) }
   contained_by { sphere {0 , 9 } }
   open 
   pigment { rgb <0,.2,.4> }
   finish { specular.8 metallic }
}