The book that young readers hold in their hands invites them on a fantastic journey through time. It takes them to Ephesus in the 6th century BC, where they follow the young Heraclitus and his little dog, Kyôn, as they search for the sources of the Caustrous River. Heraclitus observes nature and expresses some ideas to explain the world around him. Through ten authentic excerpts rendered in Modern Greek (the original ancient text is also provided), children are introduced to the thoughts of the great pre-Socratic philosopher, who articulated the principle of continuous change that governs our world.

Vicky Kalogiratou was born and raised in Athens. She studied philosophy and economics at the University of London, holds a Master’s in classical philosophy from King’s College, and a doctorate in mass media from the University of Thessaloniki. She has taught communication at Harokopio University, Open University, and Beijing International Studies University, and has participated in research projects at EKKE. She has more than twenty publications and papers on communication, philosophy, and mass media in Greece and abroad. She has been working at a shipping company since 2007 as head of the press office, public relations, and marketing.

Daniella Stamatidi is a graduate of the School of Fine Arts and works as a painter, illustrator, and visual arts teacher. She has been involved in children's book illustration since 2000 and has illustrated more than 100 books. She has participated in numerous illustration and painting exhibitions in Greece and abroad, and since 2010 has collaborated with the Frysira Gallery and Museum. In 2017, she was a member of the committee for the Bologna International Illustration Exhibition, where she also conducted a masterclass. In 2021, two books with her own text and illustrations were published, and she has received many distinctions in Greece and abroad.