In order to capture the cool effects in Purity Ring’s “Push Pull” video, vocalist Megan James apparently had to learn how to sing the chorus to the track backwards. And because that’s a pretty impressive feat, she posted a video on the band’s Tumblr yesterday showing off her skill. “you can’t really tell from the official vid but i learned the chorus backwards… also i made the costume,” she wrote. Check it out below.

Here’s the original video — you can kind of tell where she starts to sing it backwards.

Another Eternity is out 3/3 via 4AD.