Stone carving process work starts with the selection of a piece of suitable marble for carving a specific object. Good sculptors can carry out carving in a direct way through imagination, without creating a modifiable clay model first. This type of stone carving process is often called direct carving, in which an object is carved directly into marble, with imagination as a guideline. Typically the sculpture will make a rough sketch on marble block to start and develop the work along the way. This carving method is very inspiring but could also have certain problems. The sculptor may have to repeat his work several time before a successful completion, which could cause significant waste in time and marble materials.