The establishment of panoptic in the English language can be attributed to two inventions known as panopticons. The more well-known panopticon was conceived by the English philosopher Jeremy Bentham in 1787. Bentham’s panopticon was a circular prison with cells arranged around a central tower from which guards could see the inmates at all times. The other panopticon, also created in the 18th century, was a device containing pictures of attractions, such as European capitals, that people viewed through an opening. Considering the views that both inventions gave, it is not hard to see why panoptic (a word derived from Greek panoptēs, meaning "all-seeing") was being used by the early 19th century.