The process of building up the packet, inserting greased paper, collecting and organizing the numerous tiny parts (there are usually 8-12 layers of different veneers in a packet; if there are 50 individual pieces in the image, you will have 400-600 pieces to keep track of...and don't cough or sneeze), piecing them together, gluing them down in reverse image, and so on is actually very complicated.
The way that this operates is that you sit on the seat while moving a very, very fine jeweler's saw blade back and forth through a packet of different veneers. The process of building up the packet, inserting greased paper, collecting and organizing the numerous tiny parts (there are usually 8-12 layers of different veneers in a packet; if there are 50 individual pieces in the image, you will have 400-600 pieces to keep track of...and don't cough or sneeze), piecing them together, gluing them down in reverse image, and so on is actually very complicated. It takes a lot of patience to do even a small image.