In this week’s free Deke’s Techniques movie, Deke places a glamorous portrait behind a ribbed glass effect in Photoshop. It’s step one in an homage to Madonna’s MDNA album cover, which uses a repeating gradient that you create yourself, which is then applied as a displacement map. In other words, this:

Plus this:

Equals this:

If you’re a member of lynda.com, Deke’s got an exclusive movie this week in which he riffs off this idea, but with a displacement map created with the Glass filter.

If you’re not a member of lynda.com and would like to check out this exclusive movie, the entire Deke’s Techniques collection, and every other bit of awesome in the lynda.com library, you can sign up for a free 10-day trial at lynda.com/deke.