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. Or take the (big) "Please Ignore This" from 2018 and compare it to other Bieniektext textart. What's the difference? It's only the size.

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.

What is the differance between Installation Art , "other conceptual art" and sculpture?

Installation is somehow big. If you can't carry it away it's an Installation.

If it's small enough that you can carry it away and when it's technically not unique (so you can't recognize a signature by the making, or - even - somobody else did it, like the "overpainted Sebastian Bieniek") but - may be - by the "spin" of the idea, than it's  Bieniek's "other conceptual art".

And than: sculpture is when it's made by the artist himself and one needs a little "artist like" skills to do it, or at least everbody would do it kind of different, but this "different" was made by the artist himself.

Nevertheless some artwork like "Recycled Sol LeWitt" , or the "The Stolen 100 DM" are still hard to collate. What is it? At the beginning it's "Action Art", than depending on the presentation, it could be an Installation (if you take a lot and make it big), and if you just take (one) the final result could also be a sculpture, but according to the definition "without special skills and skill-signature it's other conceptual art, it's "other conceptual art.

(Bieniek's definition)

"Birdshit on Gold" (Vogelschiss auf Gold), conceptual artwork by Sebastian Bieniek (B1EN1EK), 2018.

"Birdshit on Gold" is a work that actually builds on the 2013 performance "My Friend Mr. Winker from the Deutsche Bank".

Sometimes a performance leads to an idea, which in turn leads to a lasting work, because the work is a metaphor for something bigger and so "Birdshit on Gold" is.

The series contains six paintings on canvas in different sizes - so a lot of bird shit.

It was a lot of hard work to creat these artworks. A lot of birds had to shit on it very, very hard... As you can see here.

Birds shitting on canvas for Sebastian Bieniek's "Birdshit on Gold" conceptual artwork, 2018.

No fake, no jocke, they are really shitting on Gold to create "Birdshit on Gold" by Sebastian Bieniek, 2018. We could send

you hundreds of pictures of this, but we think "two are enough".

"Birdshit on 4 square meter Gold" or "No. 1" ("Vogelschiss auf 4 Quadratmeter Gold" oder  "Nr. 1"), 200 x 200 cm. Gold and

bird shit on canvas. Sebastian Bieniek, 2018.

"Birdshit on 0,25 square meter Gold" or  "No. 2" ("Vogelschiss auf 0,25 Quadratmeter Gold" oder  "Nr. 2"), 45 x 55 cm.

Gold and bird shit on canvas. Sebastian Bieniek, 2018.

"Birdshit on 0,25 square meter Gold" or "No. 3" ("Vogelschiss auf 0,25 Quadratmeter Gold" oder "Nr. 3"), 45 x 55 cm.

Gold and bird shit on canvas. Sebastian Bieniek, 2018.

"Birdshit on 0,25 square meter Gold" or "No. 4" ("Vogelschiss auf 0,25 Quadratmeter Gold" oder "Nr. 4"), 45 x 55 cm.

Gold and bird shit on canvas. Sebastian Bieniek, 2018.

"Birdshit on 0,25 square meter Gold" or "No. 5" ("Vogelschiss auf 0,25 Quadratmeter Gold" oder "Nr. 5"), 45 x 55 cm.

Gold and bird shit on canvas. Sebastian Bieniek, 2018.

"Birdshit on 4 square meter Gold" or "No. 6" ("Vogelschiss auf 4 Quadratmeter Gold" oder  "Nr. 6"), 200 x 200 cm. Gold and

bird shit on canvas. Sebastian Bieniek, 2018.