Concept designer Ben Geskin appears to have discovered the feature that isn’t advertised by OnePlus, leading us to wonder if the company was even aware of the trick.

Other tech reviewers with the device posted similar photo evidence on Twitter:

Filters are commonly built into smartphone camera apps to let you take photos with cool colour and lighting effects. It seems like the combination of camera sensor and filter in this case has produced an unexpected X-ray mode. OnePlus has yet to comment if this was an Easter egg it has been waiting for people to find.

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Henry is Tech Advisor’s Phones Editor, ensuring he and the team covers and reviews every smartphone worth knowing about for readers and viewers all over the world. He spends a lot of time moving between different handsets and shouting at WhatsApp to support multiple devices at once.