Exploring the concept of “tsu-tsu-mu” as a design methodology. An eggshell holds new life, a gift given from one person to another is wrapped in caring feelings. The act of “tsu-tsu-mu” – wrapping, enveloping, or surrounding – is sometimes seen as something superfluous, something inessential, but it cannot be said that anything is at its best in an exposed or scattered state. This book considers the act of “tsu-tsu-mu”, which connects the inside and the outside while caring for others, as a new typology of design and explores its possibilities through various works and activities related to “tsu-tsu-mu."