Parachronism
Encyclopedia
A parachronism is anything that appears in a temporal
Time
Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....

 context (time period) in which, though not sufficiently out of place as to be impossible, it is not normally found. The item is often an object, but may be an idiomatic expression, a technology, a philosophical idea, a musical style, a material, a custom, or anything else sufficiently closely bound to a particular period as to seem strange when encountered in a later era.

Parachronisms are objects or ideas which were once common, but are now considered rare or inappropriate. They often take the form of obsolete technology or outdated fashion. This is different from a prochronism, in which the object or idea has not yet been invented when the situation takes place, and therefore could not have existed at the time. Thus a suburban housewife in the United States around 1960 would not ordinarily use a washboard
Washboard
A washboard is a tool designed for hand washing clothing. With mechanized cleaning of clothing becoming more common by the end of the 20th century, the washboard has become better known for its originally subsidiary use as a musical instrument....

 for laundry after washing machine
Washing machine
A washing machine is a machine designed to wash laundry, such as clothing, towels and sheets...

s had become the norm, and few teenagers of that time would be listening to ragtime
Ragtime
Ragtime is an original musical genre which enjoyed its peak popularity between 1897 and 1918. Its main characteristic trait is its syncopated, or "ragged," rhythm. It began as dance music in the red-light districts of American cities such as St. Louis and New Orleans years before being published...

music.
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