What is "will o' the wisp"

n. 1 (context British folklore English) A strange light that attracts travellers from pathways into dangerous marshes or graveyards. 2 (context idiomatic English) A delusional or otherwise unobtainable goal that one feels compelled to pursue.

Will o' the Wisp (Dr. Jackson Arvad) is a fictional character, a supervillain appearing in American comic books published by Marvel Comics. He is a physicist who gained control over the electromagnetic attraction between his body's molecules, allowing him to adjust his density (like the Vision). He is most often a foe of Spider-Man.

Will O' the Wisp is the sixth studio album by Leon Russell. The album was released in 1975 on Shelter Records. It peaked at No. 30 on the Billboard albums chart and remained on the chart for 40 weeks. The album covered was designed and illustrated by artist/actor Gailard Sartain.

It features the hit single, "Lady Blue", which reached No. 14 on the Billboard Hot 100 singles chart. The album was certified gold in 1976.

Will O' the Wisp is a 1931 novel by the French writer Pierre Drieu La Rochelle. It has also been published in English as The Fire Within. It tells the story of a 30-year-old man who after military service followed by a few years in international jet-set life has become burned out, addicted to heroin and tired of living. The author's source of inspiration for the main character was the surrealist poet Jacques Rigaut (1898–1929).

The novel has been the basis for two feature films, Louis Malle's The Fire Within from 1963 and Joachim Trier's Oslo, August 31st from 2011.