The Coptic stitch is a traditional bookbinding technique that dates back to early Christian Egypt. It involves sewing together individual sections of a book, known as signatures, using a series of interlocking stitches. This method creates a flexible spine, allowing the book to open flat, which is ideal for sketchbooks and journals. In Coptic stitch binding, the thread is typically visible on the spine, adding an aesthetic element to the finished product. This technique can be used with various materials, including paper, leather, and fabric, making it a versatile choice for artists and bookbinders alike.