An open window.

An Open Window, painted in 1907, gives direct visual access to the light source that Holsøe habitually implies through its effects on interior surfaces. The open window is one of European painting's most resonant motifs, carrying connotations of threshold, freedom, contemplation, and the border between domestic enclosure and the wider world. In the Danish interiorist tradition — associated above all with Vilhelm Hammershøi, whose influence on Holsøe was significant — the window organises the domestic space as a light-filled chamber against which the outside world is glimpsed but rarely described. The 1907 date places this canvas just before the prolific 1908 group of interiors, suggesting that Holsøe was deepening his investigation of domestic light by confronting the window directly rather than deducing it from its effects.

An open window introduces the highest value in the interior composition — the bright sky or garden beyond — and requires Holsøe to calibrate all interior values against this anchor. The window frame itself, receiving direct light on its inner face and casting shadow on the wall, creates a miniature light study within the larger one. The view beyond the window, if articulated, must be rendered with values that recede convincingly while competing with the interior for attention.