Window gratings were once a ubiquitous sight in Taiwan. Today the theft-deterrent function of the window gratings gradually shifts into a home concept. We use window gratings as a design concept, using the totem element of the window gratings as the main modeling unit of this installation. Arrange all the units to create a fascinating visual effect through discrete design. The production method of Graffit_Wall renovates the creation and vocabulary of traditional window gratings in a digital manufacturing method.