As blank. Anything engaged or attached to a wall, with no openings or glazing, used decoratively, such as an arcade or tracery, is described as blind, as in a blind arcade or blind tracery. A blind story is a wall façade at the top of a building, essentially a raised parapet, without rooms behind it, and unroofed, employed for architectural effect to conceal, e.g., a roof. It also can refer to a tribune in a church. 2. Device for partially or wholly preventing light from passing through an opening, such as a piece of flexible material attached at the top to a roller on which it is unwound or wound, or a screen with fixed or moveable slats (Venetian blind).