Answer:
It is a good way to protect your artwork.
It was initially part of the frame and mat of wood.
During the renaissance, it was made out of paper.
At the beginning of the 19th century, cardboard was invented. Later on, mats for artwork were mass produced out of cardboard.
Nowadays, there is a digital mat that can be used by professional designers.
Explanation:
Hope this helps!
An outline is being defined as a 2 dimensional shape which is the answer. The outline also known as the list being arrange to portray the hierarchical relationship and known as a tree structure. It is used in order to portray the main points or a topic in a subject.
Depends on the medium but if painting, this technique is known as Impasto, layering paint thickly on the canvas making the strokes of the brush or knife visible. When dried the paint appears to be coming out of the canvas creating a three dimensional effect and providing texture. one notable artist that used impasto for its more expressive qualities is Vincent van gogh.