Designers Luke Sturgeon and Shamik Ray from the Copenhagen Institute of Interaction Design have managed to visualize the force field of magnetic and electric charges being emitted from the MacBook, reports Wired.

To obtain the images Sturgeon and Ray holed up in a pitch-black, totally silent room for three days to experiment with different techniques. They ended up building an Android app to help with the process.

The phone, with its built-in magnetic sensors, acted as a sort of “light brush” that reacted based on the strength of the EMF being read. To capture the streak of light coming from the radio, they would slowly drag the phone over the device and wait for the long exposure image to process.

“The gratification that came from capturing each exposure reflects the similar experience in dark-room photography, slowly watching each photograph develop,” Sturgeon explained. “We were surprised by the difference in magnetic strengths between objects and how strong the electromagnetic field is around hard drives and laptop computers and mobile phones, all of which we live in constant close proximity to every day.”

You can check out photos and video below that show the forces being emitted from the MacBook.

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