If there is one thing that really struck me in the film STAR WARS it was the creation of enormous machines that moved in the desert like strange large tanks but also giant campers. Aliens could come to earth and move around in similar machines, useful for travel but also defence or places to stay during their tourist visits. Some would be used to manufacture things, substances, weapons or food. Or to create small housing colonies or alien production centers. Hello earthlings, would you like a ride on our moving machines?