In 1782, visitors to London’s Royal Academy of Arts stood paralyzed before Henry Fuseli’s masterpiece, The Nightmare. The canvas depicted a woman draped in pale white, draped lifelessly across a bed as a grotesque, simian demon sat squarely upon her chest. Nearby, a ghostly horse peered through dark velvet grove street art drapery with vacant, glowing eyes. The public was simultaneously horrified and transfixed by its raw, overt sexuality and psychological terror. Yet, for over two centuries, the viewing public only understood half of the horror. The deepest, most venomous secret of the painting remained completely hidden out of sight, pressed flat against the gallery wall.

Modern art conservators later made a stunning discovery when examining the structural integrity of the canvas. Painted on the reverse side of The Nightmare is an entirely separate, unfinished portrait of a beautiful, blonde Swiss woman named Anna Landolt. This hidden image provides a crucial key to the painting. It transforms a seemingly universal depiction of a dream into a highly personalized, deeply bitter act of psychological vengeance.

To understand the portrait on the reverse, one must look into Fuseli’s turbulent personal life. In 1779, while traveling in Zurich, Fuseli met Anna Landolt, the niece of his close friend Johann Kaspar Lavater. Fuseli fell into a manic, obsessive love with her. He wrote feverish letters detailing his passion, famously confessing to Lavater that he dreamed of lying beside her, fusing his soul and body with hers.

Fuseli formally asked for Anna’s hand in marriage, but his romantic ambitions were brutally crushed. Anna’s father, a wealthy and influential Swiss magistrate, thoroughly despised the volatile, eccentric painter. He fiercely rejected the proposal and forbade any further contact. To ensure the separation, Anna was swiftly married off to a stable, wealthy family friend. Heartbroken, humiliated, and consumed by a toxic mix of longing and rage, Fuseli fled to England. He immediately channeled his thwarted sexual energy into his art.

Art historians now widely agree that the vulnerable, swooning woman on the front of the canvas is a direct surrogate for Anna Landolt. By painting The Nightmare directly over her unfinished portrait on the reverse, Fuseli enacted a cruel, symbolic assault.

The painting functions as a multi-layered mechanism of revenge:

• The Incubus as the Artist: The squatting demon is an incubus, a mythological entity believed to prey sexually upon sleeping victims. This creature acts as Fuseli’s spiritual proxy, physically dominating the woman who denied him in the waking world.
• Geographical Piercing: Because the canvas fabric is thin, the physical location of the demon crouching on the front aligns almost perfectly over the torso and heart of Anna’s portrait on the reverse.
• The Void of Control: By depicting Anna in a state of helpless sleep paralysis, Fuseli strips away the autonomy she used to reject him, trapping her forever in a state of eternal submission.

Ultimately, The Nightmare is far more than a pioneering work of Gothic Romanticism or a precursor to Freudian dream analysis. It is an artifact of pure, unadulterated spite. By burying Anna Landolt’s true face on the back of the frame, Fuseli ensured that whenever the world marveled at his terrifying masterpiece, they were unknowingly witnessing his ultimate, eternal possession of the woman who broke his heart.