As we know from official Pentagon documents, UFOs are usually circular, triangular or even a white oblong like a ‘Tic Tac’.

Now, the US government can add another shape to its list – and it’s like nothing we’ve ever seen.

A photographer in Chicago has shared his stunning shot of a spooky object that was changing colour while it was stationary in the night’s sky. 

Depending on the observer, it resembles a mask, an alien face, an indigenous totem, or even Rafiki the monkey from The Lion King. 

Experts are baffled as to what it might be, although they called the image ‘beautiful and ‘spectacular’. 

The remarkable shot was taken by Dietrich Zeigler, a photographer in Chicago, and shared exclusively to MailOnline. 

‘It was around evening just as the sun dipped below the horizon,’ he said. 

‘I noticed some colorful shimmering and took out my 70-200 MM lens and shot this. 

‘The object’s appearance was striking, with a palette of purple, gold and green.

‘It seemed to be changing colours, but the shape remained the same which looks like a mask.

‘After quickly heading indoors to examine the photos, I was unable to locate it in the sky again.’ 

Mr Zeigler said it ‘seemed as stationary as a star’ to the naked eye, although slight differences in the photos he took suggested it might have been moving slightly.

‘I was quite startled upon reviewing the photos on a larger screen,’ he said. 

‘Even now, I frequently gaze at the sky, both during the day and at night, hoping to witness something as remarkable.’ 

‘Yet, nothing similar has crossed my view since that intriguing evening.’ 

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