The Coluans appear as green-skinned humanoids with exceptionally long lifespans and very high intellectual capacities, both said to be due to genetic manipualtions. Living in a technologically highly advanced society with space faring capacity, They developed a computer network to run their world. The system developed sentience and took over complete control of the planet. The Coluans were under the rule of these Computer Tyrants for millenia until the end of the twentieth century. After their liberation from the Tyrants by one of their scientists, they prefered theoretical research to experimentation. But, accustomed to the rule of the Tyrants, stagnated in both fields.
Source: DC Universe "Legion of Superheroes", "Legion", "Legionnaires"
Colu uses its shrinking technologyto make maximum use of its surface area.