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Go all the way around and the wizard’s curtain is pulled back to reveal a surprising array of mechanisms that create the magical optical effects out front.

Walk beneath a tower’s mirrored walls and into its inner sanctum, and assorted optical effects unfold overhead, bathing visitors in their unusual light.

"This development leap enables new optical effects and application concepts thanks to the 3D aspect."

The research has wide-reaching implications, from everyday optical effects to laboratory tests of the general theory of relativity, while giving an idea of why time has a preferred direction.

Though halos are not uncommon in the UK, the combination of other optical effects is more unusual.