Recording Projection-Mapped Windows: How to Track Lit Panes Across Middle and Outer Windows

Record this scene by separating window outlines, pane divisions and illuminated regions. Keep the middle and outer window groups distinct, then mark individual lit panes without filling gaps in the layout.

The defining detail is selective illumination: projected light picks out individual panes within middle and outer windows. A useful visual record must preserve both the window group each pane belongs to and the extent of light inside it. This guide uses a sketch with accompanying notes to make those relationships explicit.

The supplied description does not identify pane counts, exact lit positions, colors or a change sequence. Those details must remain unspecified. The drawing concepts cited below support the recording method; they do not document this particular scene.

Establish the window groups before marking the light

Begin with the largest confirmed divisions: the middle windows and the outer windows. Preserve these as separate groups rather than turning the scene into one continuous grid. Leave enough space around each group for labels and notes about its internal panes.

Use the spatial information available without extending it. The words “middle” and “outer” establish a relationship, but they do not establish an exact number of windows, equal spacing or mirror symmetry. Do not automatically turn the description into one central window flanked by two matching windows.

Draw confirmed window contours lightly before adding internal divisions. Getty explains that lines can define edges and that contours can establish two-dimensional shapes. Applied here, this provides a practical order: establish each visible window boundary, then place the pane boundaries inside it. Getty, Understanding Formal Analysis (https://www.getty.edu/education/teachers/building_lessons/formal_analysis.html).

Check the structural sketch before shading anything. Can each pane be assigned to a particular window? Can each window be assigned to the middle or outer group? If the answer is unclear, resolve the labels before adding light. Otherwise, an accurate bright shape may end up attached to the wrong window.

When a boundary is unspecified, describe the gap in a margin note. Avoid completing a neat grid simply because the first few divisions suggest one. A deliberately incomplete diagram can preserve the available information more faithfully than a finished architectural drawing.

Give each identifiable pane a stable address

A pane address connects a written observation to one location in the sketch. Use a consistent order based on the recorded view. Identify the window group first, the individual window second and the pane position third.

For a clearly established rectangular grid, rows counted from top to bottom and columns counted from left to right are a convenient drawing convention. Keep that convention unchanged across the record. Restart the row and column count within each window so that pane positions remain local to their enclosing frame.

For example, in a hypothetical window with a confirmed grid, “middle group, window A, row 2, column 1” would identify one pane. This is an illustrative notation choice, not a claim that the supplied scene contains that window or pane arrangement.

If the divisions are irregular or their full arrangement is unclear, assign letters directly to confirmed pane shapes instead. Do not force them into rows. A label beside a known outline can identify a pane without implying additional panes beyond it.

Use three separate recording states:

• Lit: illumination is established for that pane or a specified part of it.

• Unlit: the pane is established as outside the illuminated selection.

• Unspecified: the available description does not establish its illumination.

Keep unspecified panes visually distinct from confirmed unlit panes. For example, label them in the margin rather than using the same dark fill for both. This prevents missing information from becoming an invented part of the light pattern.

Record the illuminated region inside each pane

A pane boundary and an illumination boundary answer different questions. The first identifies the window subdivision; the second identifies where the projected light appears. Record them separately, even when they coincide.

For every identifiable lit pane, determine whether the available information establishes full coverage or only a smaller region. If partial coverage is known, preserve its position within the pane and its visible outline. If the extent is unspecified, note that limitation rather than filling the entire pane.

Contour drawing offers a suitable starting technique. The National Gallery of Art describes contour as reducing objects to simple lines and forms; it also explains how hatching and crosshatching build tone and texture. For this record, use contour for boundaries and a restrained tonal treatment for illumination differences. National Gallery of Art, Explore the Basics of Drawing (https://www.nga.gov/educational-resources/explore-basics-drawing).

Choose a clear legend before applying tone. One illustrative approach is to reserve the lightest paper for illuminated regions, shade confirmed unlit regions and label unspecified areas separately. This is a drawing convention, not an assertion about the scene’s colors or brightness.

Where relative brightness is established, use a small value scale and apply it consistently across window groups. The Open University defines tone, or value, as how light or dark a color appears. That distinction lets a sketch record brightness relationships without inventing hue. OpenLearn, In what way is dark and light colour used? (https://www.open.edu/openlearn/history-the-arts/making-sense-art-history/content-section-5.6).

Keep the material relationship equally precise: these are windows subdivided into panes, with projected illumination selecting regions within them. Add frame texture, glass reflections or transparency only when supplied. A bright pane alone does not establish any of those additional surface details.

Compare middle and outer windows through their gaps

Once the lit regions are marked, examine the spaces between them. Which pane boundaries interrupt the illumination? Are separate lit regions divided by confirmed unlit panes, by window frames or by unspecified areas? Preserve those distinctions.

This check adapts an established drawing exercise. The Whitney Museum recommends sketching the negative spaces around objects to examine their shapes. Here, inspecting the intervals around the illuminated regions provides a second way to check their placement. It is a recording aid derived from that exercise. Whitney Museum of American Art, Positive and Negative Space (https://whitney.org/education/schools-educators/K-12/teaching-materials/activities/115).

Compare the groups by confirmed relationships rather than by overall impression. Two windows might each contain several lit panes while placing them differently. A written total would lose that distinction; a pane address and an outlined lit region would retain it.

Useful comparison notes answer specific spatial questions:

• Which confirmed lit panes share an edge, and which remain separated?

• Does a lit region occupy a whole pane or only part of it?

• Which visible divisions remain between neighboring illuminated regions?

• Which relationships between middle and outer windows are established, and which remain unspecified?

Do not copy the middle group’s selection onto the outer group to make the composition feel balanced. Record each group independently, then compare them. Any correspondence should emerge from the available details.

Write a caption that matches the drawing’s certainty

The caption should identify the scene’s defining relation, then supply only the locations the record actually establishes. For the supplied description, a complete factual caption is: “Projected illumination selects individual panes within the middle and outer windows; exact pane positions and illuminated extents are unspecified.”

A more detailed caption becomes appropriate only when more detailed observations are available. Use the same pane labels as the sketch and describe coverage separately from brightness. This keeps the prose traceable to visible marks instead of introducing a second, slightly different layout.

Keep the record to the established visual state. No animation or order of illumination is supplied here, so arrows, numbered stages and descriptions of light moving between windows would add unsupported events.

Before finishing, trace the record in both directions: from every written pane reference to its drawn location, then from every illuminated shape to its accompanying note. Remove any mark that implies an unsupported count, symmetry, texture or transition.

The finished record should make the selection legible at pane level while retaining the separation between middle and outer windows. Its value lies in preserving those exact relationships—and leaving unspecified details visibly unresolved.

Sources

• Understanding Formal Analysis — Getty (https://www.getty.edu/education/teachers/building_lessons/formal_analysis.html)

• Explore the Basics of Drawing — National Gallery of Art (https://www.nga.gov/educational-resources/explore-basics-drawing)

• Making sense of art history: 5.6 Question 5: In what way is dark and light colour used? — OpenLearn, The Open University (https://www.open.edu/openlearn/history-the-arts/making-sense-art-history/content-section-5.6)

• Positive and Negative Space — Whitney Museum of American Art (https://whitney.org/education/schools-educators/K-12/teaching-materials/activities/115)