The "Potato Tower" is a popular DIY kit for hobby gardeners with limited space. By searching the internet one can find some very clever ways to produce relatively large amounts of potatoes on a small area. For all amateur balcony gardeners that lack the necessary DIY skills to make the structure themselves, the startup team made a ready-made 'Potato tower', Paul potato. All you need to do is add potatoes. 

Read more about this story and the team behind it on derbrutkasten.com (the article is in German).