The reason Sub-Layer Three exists is because there is a Sub-Layer Four. Marzians generally have non-hectic lives, however, even on Marz most people have to work and Sub-Layer Four is where they go to ‘pay the bills’. Factories and assembly lines for tens of thousands of high-tech devices and vehicles can be found here – but also clothing and fashion accessories. ZeeZee fashions makes its amazing range of fashion items from Sub-Layer Four – although ZeeZee herself is often inspired by what she sees on Urth.