The article discusses the concept of 'thickness' in art and literature, referring to the depth and complexity that rewards close attention and interpretation. The author reflects on their own experience of discovering this concept through encounters with works like Hieronymous Bosch's 'The Garden of Earthly Delights'. The article identifies four 'thickening agents' that contribute to this quality: roads not taken, leaving space for the reader's interpretation, reasons and motivations behind the work, and the artist's blood sacrifice or investment. The author also explores the idea that the absence of thickness can be seen in 'thin' works that lack depth and substance.