I've encountered some deceptively uncomfortable furniture before, but I think if I ever sat on this Concrete Soft chair, it would take the prize for being the least ergonomic seating choice ever.
This soft cushion-masquerading chair is the work of Anne-Mette Manelius, who has a strong obsession with concrete. This cement chair is riveting it its seat patterns, which look like something you'd normally find at any regular sofa store. The cushions even come with floral prints, but alas, the illusion is somewhat betrayed by Manelius' inclusion of bolts onto the seating.
Still, the Concrete Soft chair is as unique as seating gets. And who doesn't want the honor of saying they sat in a chair made entirely out of concrete?