C6-T is a manifestation of functionality, sustainability and design. C6-T is a modular system of titles developed as an indoor air purifier and thermal/acoustic insulator. C6-T is made from parcel delivery cardboard and coal waste, it is carbon neutral, fully recyclable and clean the indoor air naturally due to the highly-absorptive properties of coal. C6-T is designed to be built easily on-site, without the help of any specialist. In addition, each modular tile unit is attached due to its pure geometrical shape and can be individually removed without taking apart the entire system.