The modern theory of cohousing originated in Denmark in the 1960s among groups of families who were dissatisfied with existing housing and communities that they felt did not meet their needs. Bodil Graae wrote a newspaper article titled "Children Should Have One Hundred Parents", spurring a group of 50 families to organize around a community project in 1967. This group split in to two groups whom developed the cohousing projects Sættedammen and Skråplanet, which are the oldest known modern cohousing communities. The key organizer was Jan Gudmand Høyer who drew inspiration from his architectural studies at Harvard and interaction with experimental U.S. communities of the era. He published the article "The Missing Link between Utopia and the Dated Single Family House" in 1968, converging a second group.