Spain-based Sergi Cadenas comes from a family of ironworker craftspersons, and at age 48 he runs the family's fabrication firm, Ferros D'Art Cadenas. However, Cadenas also happens to be a Postwar & Contemporary artist who has developed a stunning, lenticular oil painting technique:

Growing a bit more macabre:

This one's not only to do with aging, but with turning a young pop icon into an older famous scientist:

So how does he do it? As Galeria Jordi Barnadas, which shows Cadenas' work, writes:

"[Cadenas] places thin vertical lines made with painting paste on the canvases and, once the paste is dry, paints two different portraits on each of the two sides of the almost two hundred lines.

"Beyond an exceptional technique that is difficult to execute and requires great precision and beyond the optical effect, Sergi Cadenas' work impresses with its strong discourse. To capture through painting: the passing of the years, the idea of death, intelligence opposed to physical beauty, equality of races or opposite feelings, is a great exercise in observation and analysis."