The visual style of "The Cabinet of Dr. Caligari" is dark, twisted and bizarre; radical and deliberate distortions in perspective, form, dimension and scale create a chaotic and unhinged appearance. The sets are dominated by sharp-pointed forms and oblique and curving lines, with narrow and spiraling streets, and structures and landscapes that lean and twist in unusual angles, giving the impression they could collapse or explode at any given moment. Film critic Roger Ebert described it as "a jagged landscape of sharp angles and tilted walls and windows, staircases climbing crazy diagonals, trees with spiky leaves, grass that looks like knives". The sets are characterized by strokes of bold, black paint. The landscape of Holstenwall is painted on canvas, as opposed to a constructed set, and shadows and streaks of light are painted directly onto the sets, further distorting the viewer's sense of perspective and three-dimensionality. Buildings are clustered and interconnected in a cubist-like architecture, surrounded by dark and twisted back alleys. Lotte Eisner, author of "The Haunted Screen", writes that objects in the film appear as if they are coming alive and "seem to vibrate with an extraordinary spirituality". Rudolf Kurtz, screenwriter and author of "Expressionismus und Film", likewise wrote "the dynamic force of objects howls their desire to be created". The rooms have radically offset windows with distorted frames, doors that are not squared, and chairs that are too tall. Strange designs and figures are painted on the walls of corridors and rooms, and trees outside have twisted branches that sometimes resemble tentacles.