Painting paper was cheaper and easier to handle than painting canvas, which meant that new art students commonly used it. However, oil painting was a unique painting style in that students normally had to be relatively skilled before they were taught oil painting. By then, they would have outgrown painting paper. Thus, when Chen Ge saw the painting papers on the easel, he was confused, especially regarding the identity of the painter.
Chen Ge had studied toy design and manufacture in university. His minor was in classes that were related to art and art appreciation. He could tell from stylistic choices and skills employed in the simple sketches that the painter was not a newbie.