Answer:
He is making a plant cell. The box is the cell wall, and the balloon represents the large vacuole. The marbles are the tiny ribosomes.
Explanation:
The plant cell, as well as the animal, is eukaryotic, that is, it has nucleus delimited by nuclear membrane (library). In addition to this feature, these cells have a plasma membrane and cytoplasm, structures common to any cell.
Some organelles and structures are shared with other cell types, such as mitochondria, golgiense complex, endoplasmic reticulum, ribosomes, and peroxisomes. Other structures, however, are restricted to the plant cell, that is, they are found only in this type of cell. These structures are: cell wall, plastids and cell juice vacuole.
Because of these particular organelles of the plant cell, it is possible to see that James created a structure to represent a plant cell. The box is the cell wall and the balloon represents the large vacuole. The marbles are the small ribosomes.