Final answer:
The term for a recess in a wall resembling a window or door is a 'blind arcade.' A 'pilaster' is a decorative architectural element similar to a flattened column but does not specifically refer to blind windows or doors.
Step-by-step explanation:
The term used to describe a recess in a wall that has the appearance of a window (blind window) or door (blind door) is none of the options provided in the question. The correct term for this architectural feature is a blind arcade. However, if we are to choose from the given options, a pilaster is a decorative element resembling a flat column attached to a wall, which can sometimes feature recessed decoration mimicking windows or doors for the sake of symmetry or design.
In the context of the provided information, 'blind arcades' are mentioned in relation to the architectural nuances of buildings. An arcade is a succession of arches, which can sometimes be purely ornamental and used to maintain symmetry or aesthetic. These can be found in the form of a blind window or blind door and can be implemented in various architectural styles, including Romanesque and Gothic, enhancing the aesthetic appeal and maintaining design symmetry in structures such as churches or historical buildings.