Sometimes designers do things differently just because, well, they can. It can make for very interesting looking designs, like the Tetra shed by Innovation Imperative, but it doesn't necessarily mean they are practical or long-lasting. My first thoughts about this design were:
This thing is either going to leak, or it is going to be impossibly expensive. And then it will take a little longer to leak.
More at Tetrashed Tiny Backyard Office: The Shape Of Things To Come?