Challenge 3: Object Stacking Order and Chapter 5's Fill/Stroke Stacking — Solution Walkthrough

The answer:

Per this chapter's own tip box, object stacking order within a layer
is the same underlying "order matters" principle Chapter 5 encountered
inside a single object's own fills and strokes in Illustrator's
Appearance panel. In both cases, whichever element is listed higher in
its own stack renders on top of whichever is listed lower.

Why this is the same idea at a different scale:

Chapter 5's Appearance panel stacks multiple fills and strokes on one
single object; this chapter's object stacking order stacks multiple
separate objects within one layer. The scale is different — one
object's own appearance versus many objects sharing a layer — but the
governing rule is identical: order determines the final visible
result whenever multiple things occupy the same space.

Why recognizing this pattern helps:

Once "whichever is listed higher wins visually" is understood as a
recurring rule, moving between Chapter 5's Appearance panel and this
chapter's own layer-stacking behavior requires no new concept to
learn — only the scale of what's being stacked has changed.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that object stacking order and Chapter 5's own
fill/stroke stacking are correctly recognized as the same underlying
principle applied at different scales, not two unrelated concepts.