Meccano in a toy store in London. Ranganathan returned with great interest for libraries and librarianship and a vision of its importance for the Indian nation. The system remains useful even into the modern times. He returned to and held the position of University Librarian at the University of Madras for twenty years. During that time, he helped to found the Madras Library Association, and lobbied actively for the establishment of free public libraries throughout India and for the creation of a comprehensive national library. Ranganathan was considered by many to be a workaholic. During his two decades in Madras, he consistently worked 13-hour days, seven days a week, without taking a vacation for the entire time. Although he married in November 1928, he returned to work the afternoon following the marriage ceremony. A few years later, he and his wife Sarada had a son. The couple remained married until Ranganathan's death. The first few years of Ranganathan's tenure at Madras were years of deliberation and analysis as he addressed the problems of library administration and classification. It was during this period that he produced what have come to be known as his two greatest legacies: his five laws of library science (1931) and the colon classification system (1933). Regarding the political climate at the time, Ranganathan took his position at the University of Madras in 1924. Gandhi had been imprisoned in 1922 and was released around the time that Ranganathan was taking that job. Ranganathan sought to institute massive changes to the library system and to write about such things as open access and education for all which essentially had the potential to enable the masses and encourage civil discourse (and disobedience). Although there is no evidence that Ranganathan did any of this for political reasons, his changes to the library had the result of educating more people, making information available to all, and even aiding women and minorities in the information-seeking process. The Northern Ireland crisis got an unexpected metaphorical reference in a book by S. R. Ranganathan, as "making an Ulster of the ... law of parsimony", complaining about the harmful effects of low budget on the good functioning of a library. Later career After two decades of serving as librarian at Madras – a post he had intended to keep until his retirement, Ranganathan retired from his position after conflicts with a new university vice-chancellor became