This is the back cover of the record "Pig" by Stephen Ugo Rosen, "a collection of 9 'dirty' ambient tracks".
"The term 'dirty' is used here because ambient music has a reputation for being 'pure' or lofty in many respects and this collection deliberately attempts to throw the atmospheres down in the mud."
Of course, what is a better symbol for dirtiness than pigs forced to live in such a cramped space that they have no chance of keeping themselves clean?
Placing a naked human among them (with some chains across his shoulders for potential kinkiness/fanservice) puts the plight of pigs raised for meat in a whole new light, because they look so very similar.
Humans get into conditions like this when imprisoned in 'inhumane' conditions in cramped cells with no access to toilets, while such conditions are the norm for most pigs raised for meat. (Sows in factory farms, who spend most of their lives in "gestation crates" - outlawed in the EU and some US states - and give birth and nurse their piglets in "farrowing crates" can't even turn around.)