Why does the change seem to only involve the content of the cell and not the overall shape?

The change in the cell's content without altering its overall shape is likely due to the principles of cellular homeostasis and structural integrity. Cells maintain their shape through the cytoskeleton and membrane structure, which provide support and stability. While the internal components can vary in response to metabolic activity or environmental changes, the cell's architecture remains intact to ensure proper function and communication with its surroundings. Thus, the dynamic nature of cellular contents is balanced by the static framework of the cell's shape.