A name with possibilities.

Keep the viewpoint still and record the change

This original light journal uses a fixed drawing frame to make successive observations easier to compare. It is a visual exercise, not a light meter or a building assessment. The example is fictional and uses a simplified grid; it does not report observations from a real room.

Set up a repeatable frame

Draw a four-column, three-row grid over a sketch of one wall. Number columns one through four and label rows A through C. Keep the viewpoint and framing fixed. For each observation, record time, cloud condition, curtain position and which cells contain the brightest visible patch. Mark partially covered cells differently from fully covered cells instead of forcing every edge into a neat category. A photograph can accompany the sketch when appropriate, but keep exposure choices in the notes because automatic image adjustments can change apparent brightness.

Read the fictional sequence

At the first fictional observation, the bright patch occupies A1 and A2. At the second, it occupies A2 and A3. At the third, it occupies B3 and B4. Across the sequence, A2 is recorded twice, while A1, A3, B3 and B4 appear once each. That is six recorded cell appearances across five distinct cells. It describes the supplied sketches only. It does not establish light intensity, duration between observations or the path of the patch during the unobserved intervals. Those would need additional evidence.

Make an artwork without rewriting the record

Use the five distinct cells as a composition study, perhaps assigning one tone to repeated coverage and another to single appearances. Keep that artistic layer separate from the observation sheet and label any simplification. A follow-up session could repeat the frame at the same times while recording changed conditions, but the result should remain a new record rather than replacing the old one. The exercise gives a designer a concrete source for a visual pattern while preserving the uncertainty that makes real daylight interesting.

Track the patch, preserve the unknowns — Illustrative reference for Solarosity. The example is fictional. Scroll the diagram horizontally on smaller screens.