What is the difference between "Performance", "Action Art", "Installation Art" and Video Art?

When the artist or the body of the artist is in focus, so the acting is part of the artwork, it's a performance. When the artist isn't visible but it's still about people and when it's that fast changing in time that you can see the "Beginning" and then "End", than it's "Action Art" (Happaning is kind of outsourced - not directed by a single artist but by many). Installation is when you can't see it "changing" in time, so it looks always the same, or can be at least restored, and when it's about objects.

However even still some installations like "My Breath rests here" ("Hier ruht mein Atem") have some performance character (at least in the creation phase), but than again not really, because than "the painting of a painting" could be also a performance, so it's more about the focus.

A recorded and shown as a video performance, without real life viewer and the interaction with the viewer like "The 30 € truth" or "Crying for this Video" for example is a video. (Definition by Bieniek)

"The Climax of Modern Democracy" performance by Sebastian Bieniek,

Hellenic Parliament, Syntagma Square, Athens, Greece, 2018.

"The Climax of Modern Democracy" performance by Sebastian Bieniek, Hellenic Parliament, Syntagma Square, Athens, Greece, 2018. The artist layed down on the sidewalk directly in front of the Greek parliament and covered himself completely with a blanket. Through the ceiling you could see him making movements that were reminiscent of sexual intercourse.

The performance is a criticism of lobbyism, the disease of Western democracy, which democracy had just made an empty label of itself.

Politics is not what happens above the blanket but only what happens below it and unfortunately there is no place under the blanket for normal voters, but there is for lobbyists.

The performance unfortunately ended after only a few minutes due to the intervention of the Greek police.

"The Climax of Modern Democracy" performance by Sebastian Bieniek, Hellenic Parliament, Syntagma Square, Athens, Greece, 2018. The artist layed down on the sidewalk directly in front of the Greek parliament and covered himself completely with a blanket. Through the ceiling you could see him making movements that were reminiscent of sexual intercourse.

"The Climax of Modern Democracy" performance by Sebastian Bieniek, Hellenic Parliament, Syntagma Square, Athens, Greece, 2018. The artist layed down on the sidewalk directly in front of the Greek parliament and covered himself completely with a blanket. Through the ceiling you could see him making movements that were reminiscent of sexual intercourse.

"The Climax of Modern Democracy" performance by Sebastian Bieniek, Hellenic Parliament, Syntagma Square, Athens, Greece, 2018. The artist layed down on the sidewalk directly in front of the Greek parliament and covered himself completely with a blanket. Through the ceiling you could see him making movements that were reminiscent of sexual intercourse.