file filing hole machine punch punching stationary cardboard circles confetti dots paper punch-out grid holes metal.background punched raster repetition shapes texture alluminum background circels construction grill maze metal pattern patterns plate platform stainless steel structure backdrop blank blank page book copyspace creases crumpled desktop education exercise book graphic homework kids learn letter lined paper lines margin note book page punch holes render school school book school work scrapbooking spiral spiral notebook student vector vertical binding white workbook wrinkled write writing pad writing paper