Cov nplooj ntawv yeej tsis sib tshooj yog tias koj txiav lawv los ntawm ib lub yob lossis ib lub boards. Kev teeb tsa yuav tsum tau ua tiav-rau-kawg, kho lub canvas nrog rau tes los yog stapler. Foiled polystyrene ua npuas ncauj tuaj yeem muaj cov txheej txheem ntawm tus kheej, yog li tsis tas yuav txhim kho cov rwb thaiv tsev. Tab sis kom ntseeg tau tias kav ntev, nws yog qhov zoo dua tsis txhob hnov qab txog cov ntsia hlau