This article proposes the kaleidoscope as a hermeneutic tool for comparative research on The Book of Sindbad the Philosopher/The Seven Sages of Rome – a frame narrative with embedded tales that circulated from the Middle Ages into the early modern period in many languages and across a vast geographical area. In recent years, scholars from a range of disciplines have increasingly shifted their attention away from reconstructing genetic relationships within the textual tradition toward the cross-cultural analysis of versions of this story matter from different linguistic and cultural spheres. This approach has the potential to offer new insights into similarities and differences between medieval societies in the East and West. However, the complex nature of the story matter and the fact that it crossed so many boundaries also poses considerable methodological challenges. The present article introduces the kaleidoscope as a dynamic metaphor to approach the multiplicity of factors involved in this kind of research. A case study of the embedded tale of the bath attendant/seneschal, examined in four early versions – Greek, Hebrew, Arabic, and Latin – serves to demonstrate the heuristic potential of this tool. After an introduction, the article discusses the material within its historical and cultural contexts, the principal features of the frame narratives; the characteristics of the embedded stories; the relationship between frame narrative and embedded tale. Throughout, the kaleidoscope metaphor serves to visualize the interaction between cultural and material contexts (the tube of the kaleidoscope), frame narrative (the mirrors), and embedded stories (coloured stones): from the interplay between these elements the moral lessons of each version emerge (refraction resulting in an intricate pattern) to the audience (person looking through the lens). Turning the kaleidoscope results in ever-changing and mesmerizing patterns for the onlookers to contemplate, each representing a different version of The Book of Sindbad the Philosopher/The Seven Sages of Rome.