Look at where they are standing. Behind the grinning, shirtless crowd rises the unmistakable curved portico of the White House, its flag snapping at the top of the frame, its lawn turned into the most audacious house party imaginable. The whole thing is rendered in grainy black and white, and your eye lands first on the fists full of cash fanned out like playing cards, then on the small bodies of children threaded through the men, then, near the very bottom, on the figure no party invitation explains: a white judge lying dead at their feet, eyes crossed out into little X marks.

That corpse is the dare at the center of To Pimp a Butterfly. The men and children stand over the body of a corrupt white judge, jubilant rather than guilty, money raised, arms slung around each other. In the middle of it all is Kendrick Lamar, cradling a child, the calm pivot around which the celebration spins. A champagne bottle sits planted in the grass. Skin glistens. The mood is triumph, not menace, which is exactly what makes the image so unsettling to sit with.

The concept belonged entirely to Kendrick Lamar and his manager Dave Free, the two of them known together as The Little Homies. To execute it, Top Dawg Entertainment reached past the usual hip-hop visual world and tapped the French photographer Denis Rouvre, a man who had shot portraits of Kirsten Dunst and Oliver Stone and won a World Press Photo award for his portraits of Japanese tsunami survivors. Handing a dozen kids from Compton, posed on the White House lawn with a judge under their heels, to a celebrated outsider read as its own argument: that America's political structures are penetrable, and vulnerable.

The faces were not models. Many of the people crowded into the frame were real friends from Kendrick Lamar's childhood in Compton, which is why the scene feels less like a staged tableau and more like a block party that wandered across the country and refused to leave. The children matter as much as the men. The youngest in the photo is being held; others stand grinning at the edges, hands up, fully part of the moment rather than props in it.

The final sleeve was assembled by graphic designer Vlad Sepetov, who has described the way the idea landed on him as a late-night text from the manager, forcing him to mock the whole thing up fast from supplied photos. He framed Rouvre's image inside a plain silvery border and dropped the black Parental Advisory box into the lower right corner, the only piece of officialdom that made it onto the cover. There is no title, no artist name, no typography fighting the photograph. The picture is left to do everything.

Released on March 15, 2015, through Top Dawg Entertainment, Aftermath Entertainment and Interscope Records, the album inside was a hard turn into avant-garde jazz, funk and conscious hip-hop, its arrangements reaching back through a line that runs to Miles Davis' Bitches Brew. The cover carries that same restlessness. Rolling Stone called it one of the most visually arresting examples of album art's modern revival, a black-and-white house party staged outside the seat of power.

It arrived in the middle of the Obama era and quickly became one of its most argued-over images, a single frame read as a statement about Blackness, power, and the building looming behind the crowd. The genius of it is that nothing is shouted. A baby, a bottle, a fistful of bills, a dead man, and the White House: everyday details and one impossible one, arranged so casually that the viewer has to decide for themselves what just happened on that lawn.