Photographer Svein Nordrum captured an optical illusion known as the Brocken spectre on top of a hill in Norway. (Caters News Agency)

was on top of a misty Norwegian hill when he noticed an incredible optical illusion. The photographer took several pictures that captured the phenomenon, known as a Brocken spectre.

"The phenomena occurred when I was on the top of a hill as I had the low November sun in the back and fog in the front below," Nordrum toldThe Daily Mail. "When I got above 300 metres, the sun was getting through the mist and I suddenly noticed a strange circle of light below me."

The illusion forms when the sun casts a person's shadow in the mountains, and includes a rainbow halo if there are.

"It was amazing — my shadow was projected into the fog with some pretty trilling effects like the magnified size of the shadow," said Nordrum.

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Espectro de Brocken observado sobre el Parque Nacional Mount Rainier en Washington (Radka Chapin)