I am pretty sure you can recognize this picture
But, can you recognize this one?
You know I am reading a book about a storyteller in Ireland. The thing is that one of the stories was about Newgrange and... I google it
It is a Irish 5200 year old stone monument (older than Stonehenge and the Pyramids). The point is the chamber is iluminated only by winter solstice sunrise. To increase the light effect there is a kind of stone in the center of the chamber that reflects the light around. Awesome.