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To notice how a room changes through the day, you need only stand near the same window at several times. A careful (17) .......... can show that shadows do not move at a constant speed, even when the sky appears clear.
Their length is affected by the angle of the sun, so a simple (18) .......... made at noon may look very different an hour later.
The change is often more (19) .......... near a window frame than in the middle of the room, where the eye has fewer fixed points.
What feels like an (20) .......... shift may therefore be entirely normal.
People who keep a record can estimate the movement (21) .........., without needing specialist equipment.
Small (22) .......... between days are also revealing, particularly when cloud cover changes.
The exercise works best in (23) .........., when the contrast between light and shade is easiest to see.
It turns an ordinary room into a (24) .......... environment, reminding us that familiar places are never quite still.