The pencil case usually has two purposes: to insert a writing or drawing tool.
We can distinguish between handwriting and drawing in order to work in a more concise working environment.
To do so, I put a switch to drive the user's behavior. It is possible to indicate whether the pencil case is in writing mode or drawing mode. 
When you are in work, choose between two pencil cases, handwriting mode pencil case for writing, and drawing mode pencil case for drawing.
Ordinary and identical objects can have different properties depending on the user's intention.