Doors are always full of unknowns, and far too often it’s a gateway into another world. Every door that you open up for the first time is a surprise, a world that you’ve never seen before. Everywhere you go, doors are meant to be opened, with the exception of this one — it’s meant to stay closed for a very good reason. While what’s behind this door by why.not? is curious enough to tease our imaginations, I’m actually more intrigued by the mysterious technique used to create the door arch at the top. It’s a puzzle worth solving more than what’s behind the door.