Wolfgang Mertens demonstrates why Wilfred R. Bion's concepts are relevant to contemporary psychoanalytic work and why his ideas are significant across different schools of thought. The author presents Bion as a guide to psychoanalysis in the 21st century, highlighting how his insights align closely with many contemporary psychoanalytic and interdisciplinary findings from both theory and practice. Through fictional dialogues with representatives of various psychoanalytic traditions, Bion's models and hypotheses are vividly discussed. Key concepts such as containing, reverie, projective identification, and negative capability are explored. The conversational nature of the book illustrates contemporary discourses within the diverse psychoanalytic community and related disciplines. Mertens connects Bion's ideas to recent interdisciplinary developments.