CRITICAL DIMENSIONS are the important measurements of the accessory. For instance, if the object is going to be held in the hand, it's important to know exactly how big the object should be so it can be small enough to fit in the hand, but large enough that it doesn't fall out.

We'll learn more about this in a later module, but the basic geometric shapes are what is 

Let's create the orthographic drawing for this accessory together. Once we know the critical dimensions, we need to figure out the basic geometric shape so we can start to draw it. In this case, the basic shape is a cylinder.