Manual work is not only a technique. It is a way of thinking. Mani in opera explores making as a form of knowledge. Rather than explaining how to build objects, it examines what happens when we work with real materials, tangible tools, and limits that cannot be negotiated. Moving through the time of work and the space of the workshop—through gesture, safety, materials, repair, recycling, and error—the book offers a clear and thoughtful reflection on manual design. It avoids step-by-step instructions and idealised views of craftsmanship, focusing instead on the realities of making. Here, wood is not simply material, metal is not merely strength, and textiles are not just surfaces. Each material becomes an opportunity to question the relationship between precision and constraint, control and adaptation, durability and use. Manual work emerges as an open process that continues beyond the finished object, over time and through experience. Addressed to makers, designers, educators, and curious readers, Mani in opera is not a manual to follow, but a book to keep close—on a workbench, in a studio, or alongside an ongoing project. Because in making, what matters is not only what is produced, but how it is produced—and that way, when intentional, endures.