Kara Walker was barely out of art school when she won a MacArthur Foundation genius grant, in 1997. Back then, her early work shocked audiences in part because her murals looked so charming from a distance. Black paper shadow portraits of colonial figures seemed to dance on white gallery walls; but lean in and you’d find your nose pressed up against images of slavery’s horrors — mammies, masters, lynchings and sexual violence.

In other words, Walker is used to filling a room. But this spring she was asked to fill a warehouse — the abandoned Domino Sugar factory in New York. It’s about to be leveled to make way for condos and offices, but before it goes, Walker was asked to use this cavernous, urban ruin for something special.

Walker took me on a tour of the show a day before it opened. The factory is covered in sugar — it almost looks like insulation or burnt cotton candy.

“It’s a little bit sticky in some areas …” she says. “There’s sugar caked up in the rafters.”

I was so busy trying not to get molasses on my shoes that when I turn the corner, I’m stunned. There in the middle of this dark hall is a bright, white sphinx. The effect is the opposite of those white walled galleries; a dark space and a towering white sculpture made of — what else? — sugar.

“What we’re seeing, for lack of a better term, is the head of a woman who has very African, black features,” Walker explains. “She sits somewhere in between the kind of mammy figure of old and something a little bit more recognizable — recognizably human. … [She has] very full lips; high cheek bones; eyes that have no eyes, [that] seem to be either looking out or closed; and a kerchief on her head. She’s positioned with her arms flat out across the ground and large breasts that are staring at you.”

Walker has dreamed up a “subtlety” — that’s what sugar sculptures were called in medieval times. They were a luxury confectioners created for special occasions.

To understand where all this is going, you need look no further than Walker’s teasingly long title for the show: “A Subtlety or the Marvelous Sugar Baby an Homage to the unpaid and overworked Artisans who have refined our Sweet tastes from the cane fields to the Kitchens of the New World on the Occasion of the demolition of the Domino Sugar Refining Plant.”

I know, it’s a mouth full. But Walker has this wide smile and as she sweeps her hands around in broad gestures, white tides of sugar dust ripple at the edge of her feet — and she sells it.

“It was very fun and childlike to, you know, have your hands in a bucket full of sugar, or a 50-pound bag of sugar, throwing it out onto the floor,” she says.

She’s doing what she does best: drawing you in with something sweet, something almost charming, before you realize you’ve admired something disturbing. In this case, that’s the horror-riddled Caribbean slave trade that helped fuel the industrial gains of the 18th and 19th centuries; a slave trade built to profit from an insatiable Western market for refined sugar treats and rum.

“Basically, it was blood sugar” Walker says. “Like we talk about blood diamonds today, there were pamphlets saying this sugar has blood on its hands.”

She explains that to make the sugar, the cane had to be fed into large mills by hand. It was a dangerous process: Slaves lost hands, arms, limbs and lives.

“I’ve been kind of back and forth with my reverence for sugar,” Walkers says. “Like, how we’re all kind of invested in its production without really realizing just what goes into it; how much chemistry goes into extracting whiteness from the sugar cane.”

Walker went down a rabbit hole of sugar history, at one point stumbling onto some black figurines online — the type of racial tchotchkes that turn up in a sea of mammy cookie jars. They were ceramic, brown-skinned boys carrying baskets. Those were the size of dolls, but Walker’s are 5 feet high, some made entirely of molasses-colored candy. Fifteen of them are posed throughout the factory floor, leading the way to her sugar sphinx.

The boys are cute and apple-cheeked, but they’re also kind of scary — some of the melted candy looks a lot like blood.

“I knew that the candy ones wouldn’t last,” Walker says. “That was part of the point was that they were going to be in this non-climate-controlled space, slowly melting away and disintegrating. But what’s happened is we lost two of these guys in the last two days or so.”

Losing those figures in service of the sugar is the slave trade in a nutshell.

“Also in a nutshell,” Walker says, “and maybe a little bit hammer-over-the-head, is that some of the pieces of the broken boys I threw into the baskets of the unbroken boys.”

OK, that’s not so subtle, but it’s also not unusual for Kara Walker. She’s dressed in a shiny oversized baseball jacket emblazoned with the gold face of King Tut on it. I ask her if at a certain point she worries about doing work that is seen as being just about race.

“I don’t really see it as just about race,” she says. “I mean, I think that my work is about trying to get a grasp on history. I mean, I guess it’s just kind of a trap, in a way, that I decided to set my foot into early on, which is the trap of race — to say that it’s about race when it’s kind of about this larger concern about being.”

I tell her it’s almost impossible to talk about our history without talking about race. She replies: “There [are] scholarly conversations about race and then there’s the kind of meaty, unresolved, mucky blood lust of talking about race where I always feel like the conversation is inconclusive.”

Inconclusive, but for artist Kara Walker, ongoing.

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