The Moon as a Directional Marker
Harold and the Purple CrayonThe Moon changes from a requested feature of the night into the reference point that lets Harold locate the bedroom window.
increasing
Bearing strength in each event
decreasing
The Moon for Walking

Moonlight as an Initial Need
A condition for the outing
Harold wants to walk in moonlight, but there is no Moon. He requires it for the atmosphere and conditions of the walk he has imagined.
The Moon is created
Harold draws a Moon and takes it into the journey as part of the scene. At this stage, its function is to make the outing possible, not yet to guide him home.
The Moon in Motion

A Landmark That Follows
Presence on the route
The Moon goes with Harold when he leaves the straight path and crosses a field. Its mobility keeps it connected to his journey rather than to a distant, fixed sky.
Meaning not yet understood
Although the Moon remains present, Harold continues through unfamiliar scenes and loses his bearings. Its later directional significance has not yet become available to him.
The Window's Position

Direction Through Relation
A remembered location
Harold remembers that his bedroom window is always right around the Moon. The clue is not simply the Moon's presence but the spatial relation he knows between it and his bedroom.
The walk can end
With that relation restored, Harold makes a bed and gets under the covers. The Moon completes its progression from atmospheric necessity to a meaningful instrument of orientation.
Before the first steps of the walk
Early in the journey, while Harold takes a shortcut
Near the conclusion, after Harold's long search