"Matsuri are very organic, and have been constantly changing over time," says Manabu Haga, a professor of sociology at Sophia University. "But from a sociologist's perspective, a major transformation took place in the 1970s and 1980s." That period, Haga says, is when local communities began disintegrating as the number of nuclear families and single-person households grew. Urban dwellers became more individualistic, while graying rural villages suffered from depopulation. "From around 2000 onward, maintaining community-based lifestyles became difficult, a societal trend that has had a direct impact on festivities," Haga says. Many matsuri died out, while others adapted and survived.