Storage

I decided on making a sort of "divider" for the shelf, in order to show how different types of equipment can be stored:

The first divider allows for 9 separate storage spaces, ideal for long thin objects such as pens and pencils.

The second divider separates the shelf into four spaces, this can then fit larger objects such as scissors, craft knives etc.

Finally, the shelf can (obviously) still be used without a divider, thus allowing for even larger storage (in this case books) though since the design incorporates boxes of varying sized (some very large indeed) other items  of a large scale (such as drawings or a guillotine) would also be able to be stored.