This helmet house by Shanghai-based Tianhua architects is a literal house made out of the iconic yellow construction helmet.
Let's get things out of the way before we continue: this house is not actually inhabitable -- it's made of helmets and the point of the house is for design and art purposes, not practical purposes.
The helmet house was made for the "bi-city biennale of urbanism and architecture in Shenzhen". The point was to put a spotlight on the people of China who can't live in regular buildings. Taking the helmet, which is a tool used in the creation of buildings, and making it the building itself is pretty ironic but the actual product is really cool.
Photo Credits: designboom, thape