large sphere on the ground which reflected multicoloured light when spotlight hit it.

A farmer freind and i were culling rabbits at night useing a rifle and a very powerfull spotlight when the beam lit up a spherical object about two feilds away, It apeared to be made up of octagenel shapes which reflected the light back from the windows in a sort of multicoulered hue. It looked about the size of a small cottage,we were mystified as we new the feilds were empty,we then decided to drive over to investigate,this meant leaving the feild we were in,driving along a track then into the feild where the object was.(I forgot to say that we could only see the top two thirds of the object from the original feild.) Now here is the strange thing,i think i can remember turning the 4+4 into the feild, the next thing i can clearly remember is that we were back lamping for rabbits. The other strange thing is that after that night i forgot what had happened,it was about 5yrs later before i started to remember the incident,I did not tell anyone what happened in case they thought i had a screw loose! Eventualy i told my wife and she persuaded me to talk to my freind about it, when i eventualy managed to broach the subject he could not remember anything about it.This left me feeling quite upset as i new by now that i had not imagined it,Then about a year later he told me he could now remember seeing the sphere shining in the feild but nothing after that.
Date is approximate.  PD