A clever photographer has used some camera trickery to capture a stunning shot of what appear to be around a dozen "dancing" jellyfish in a Spanish lake. But there's a twist: There are only two jellyfish.

Spanish photographer Angel Fitor snapped the photo, titled "Medusa Ballet" (named for the free-floating life stage of jellyfish) at Mar Menor, Europe's largest saltwater lagoon. The mesmerizing image features 11 Mediterranean jellyfish (Cotylorhiza tuberculata), also known as fried egg jellyfish, whose translucent orange bells perfectly match the setting sun behind a far-off mountain on the horizon. The shot was voted the overall winner at the European Wildlife Photographer of the Year 2021 competition on Oct. 28.

However, if you look closely at the floating cnidarians, you'll realize that they look remarkably alike. That's because there are actually only two jellyfish in the shot. But this isn't a case of copy and paste; instead, Fitor used multiple flashes to capture the pair as the jellies moved across the water's surface on a gentle current.

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"For more than six years, I tried to realize this image idea, and I had to put up with countless failed attempts," Fitor said in a statement. "Which is not surprising considering the unpredictability of the factors that were prerequisite for success."

The award-winning photo was originally taken in 2014, shortly before the first of several mass die-offs of marine life in Mar Menor over the last five years that have decimated the ecosystem. The most recent die-off in August was the worst yet and led to tons of dead fish washing ashore, according to the BBC.

Environmentalists blame persistent agricultural pollution that has degraded the water quality in the lagoon and caused frequent algal blooms. Dubbed "the green soup" by locals, these blooms of algae suck up the oxygen in the water and suffocate the creatures below the surface.

Fitor described his photo as "an ode to the unique natural heritage Mar Menor once was."

The contest judges said a combination of the photographer's skill and the subject's environmental significance helped the photo win the award.

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"The powerful image spoke strongly to us jury members on many levels," competition judge Jim Brandenburg said in the statement. "After the ecological catastrophe that occurred only a short time later at the place where it was taken, it also speaks about the massive environmental problems of this region."

Originally published on Live Science.