The Japanese architect Takaharu Tezuka caused a stir in 2015 with his TEDtalk "The best kindergarten you've ever seen". As the first text-focused publication, Tezuka Architects: The Yellow Book now provides an insight into the design philosophy of the internationally renowned architecture firm. Based on a lecture by Tezuka at Harvard University Graduate School of Design (GSD), this "pocket guide" in scale and feel introduces the architects' way of thinking, using examples of seminal projects in recent years. Buildings such as the Roof House (2001), the Child Chemo House (2013), or the Fuji Kindergarten (2007) illustrate the powerful impact of Takaharu and Yui Tezuka's design and show how architecture can contribute actively to building a better society.