This book explores the groundbreaking contributions of three visionary brothers who shaped the scientific and technological landscape of the 9th-century Muslim world. Bridging mathematics, engineering, and societal needs, Banū Mūsā’s innovations in fluid mechanics and automata showcased an unparalleled coalescence of theory and practice. This book delves into their masterpiece, Kitāb al-Ḥiyal, uncovering its relevance for today’s challenges in ethical technology and sustainable innovation. By connecting their legacy with modern science, this work offers a compelling narrative that highlights the timeless interplay of knowledge, culture, and religion in advancing human civilisation.