What exactly is a book? In The Book (MIT Press 20218), Amaranth Borsuk tried to define it with respect to its status as object, content, idea, and interface. By nature slippery, the book has taken numerous forms over time and been the subject of extensive experimentation by artists, filmmakers, tinkerers, and bookbinders.In April, 2018, Amaranth Boirsuk began contacting writers, artists, and scholars she admired to ask them What is the/a book? You´ll find their answers here in an attempt to draw attention to the many other formulations of what the book is and can be.