An ancient Egyptian 10-inch statue at the Manchester Museum has been moving on its own. Though its movement is not visible to the normal human being, a time lapse recording of the statue reveals that the statue has been spinning in its glass case.

According to CBS News, Egyptologist Campbell Price notice that the statue had turned around in its display case. The 29-year-old said “I thought it was strange because it is in a case and I am the only one who has a key.”

Price continued to notice the statue’s movement, so he placed the statue in its original position and set up a time-lapse video. The video shows the statue spinning slowly during the day time when visitors are walking around in the background.

A possible explanation, according to The Huffington Post, is that the vibration from the visitors causes the 4,000-year-old statue to spin. However, this does not explain why the statue has been stationery for the 80 years that it has been on the same surface. Also, it is the only statue on that glass surface that is moving.