Vertical Garden

I've been skeptical of vertical gardens for vegetables, so it's only fair to recognize they seemingly can work for ornament.  Treehugger has a 4-year later followup on a vertical wall in Madrid.  Being cynical I wanted to check when the photos were taken because it wasn't clear.  But I finally did see a photo of the garden as originally installed, and it's definitely different than the one in the treehugger post.  They do mention an irrigation system, but apparently it's fairly carefree.