Kotnik imagines that there will soon be more sustainable building materials available on the market and that this may ultimately diminish the popularity or need for his beloved containers.
"From Volvo, Puma, Rolex, Nike to Ikea -- loads of big names have been turning shipping containers into shops or spaces that they think will enhance their brand image, " says Kotnik.
According to Kotnik, containers have been used for decades as makeshift residences and market shops in places like Africa, but it's only in the last 10 years that architects have "added value" by creating high concept designs out of them.