Give your little space mans a nice place to live and work.
From the release:
Future colonies were often built around standardized modules able to be quickly modified for a multiplicity of environments. Colony Hab: Core Set has the parts to build five basic mdoules (4"x2"x2"), a cross-shaped junction, and a garage/lab. Additional parts allow you to customize your set up with a comm array, laser turret, telescope dome, control tower, and more.