4: Haase and QR codes in the third dimension

Frank Haase 

Trinity - 3 in 1 (recent but date unknown)

Acrylic plastic with mixed media (dimensions unknown)

On artist's website (it's German, but there may be a 'translate' option in your broweser bar): Frank Haase at QR-Art.com

More QR art today (and again, a refresher on what QR codes are if needed): Haase is a German artist, who here and in a few other works has created a three-dimensional cube with embedded black balls, such that when you view the cube from different angles, the balls align to generate three unique QR codes. 

For an article with some more about this work, click here. (If you click the link to the work on the artist's website above, he also explains a good deal about it, but you will need a translate option if you don't speak German.)