John Dewey had previously encouraged the use of Froebel Gifts for building. Unit blocks are larger than Froebel Gifts and more suited to creative play on the floor. Praise for Pratt's work from John Dewey soon brought national acclaim.
Pratt founded the City and Country School in 1914 in New York.
Wipo Publishes Patent of Chang Sung, Jae Yeol Park, Dal Joong Kim, Bong GI Yoo, Gu Hyun Kim and Kwang Yong Yoo for "Elliptical Unit Block for Preparing Core Using Soft Magnetic Metal Powder and Powdered Magnetic Core Prepared Using Same" (South Korean Inventors)
Mar 15, 2013; GENEVA, March 15 -- Publication No. WO/2013/036025 was published on March 14.Title of the invention: "ELLIPTICAL UNIT BLOCK FOR...