In his lecture Philipp Hainke is going to present his recent material development based completely on natural resources. Halo is a stackable chair with a 100% ecological seat shell. The sandwich material of the seat shell uses renewable raw materials such as hemp-fibre which are pressed with a natural binding agent to form solid structures. An adhesive, made of lime and protein is used as a bonding agent to press hemp fibre and hemp hurds into solid forms. The seat consists mainly of biomass, which naturally binds CO2 and thus leads to a neutral CO2 footprint. As no artificial additives are used, the material can be returned to the biological cycle without causing any harm. The concept exemplifies the strengths and the formal possibilities of this light and resistant material.