When Studies in expression. In the monkey house first appeared in print, it quickly became one of the most widely discussed works by Charles Dana Gibson, the celebrated American illustrator behind the iconic "Gibson Girl." The drawing’s immediate popularity was due in part to its sharp wit and the way it mirrored the social preoccupations of the late 19th and early 20th centuries. Gibson’s satirical eye was so influential that his works were regularly clipped from magazines and displayed in homes and offices, a testament to the reach of his visual commentary.

The exact date and original medium of this piece remain uncertain, but its presence in periodicals like Life and Harper’s Weekly ensured its wide circulation and impact. The scene takes place inside a monkey house at a zoo, but the real focus is not the animals behind the bars—it is the human visitors, each absorbed in their own reactions. Gibson arranges a row of faces, each contorted in a different expression: amusement, curiosity, disdain, and even a hint of self-recognition. The artist’s deft linework captures the subtle interplay between observer and observed, blurring the line between spectacle and spectator.

The monkeys, meanwhile, return the gaze, echoing the humans’ postures and expressions, a visual joke that underlines the satirical thrust: who, exactly, is on display? This clever reversal recalls the social commentary of Honoré Daumier, though Gibson’s touch is lighter, his humor more genteel. As with many of Gibson’s works, Studies in expression. In the monkey house was originally created for mass reproduction rather than gallery exhibition, and its life has largely followed the fortunes of magazine illustration. While the whereabouts of the original drawing are unknown, reproductions have appeared in anthologies and retrospectives of Gibson’s career, which peaked during the so-called "Gilded Age" of American illustration.

Today, the work stands as a classic example of the artist’s ability to capture social nuance with just pen and ink, and it remains a favorite among collectors of American graphic art. Its enduring appeal lies in the universality of its humor and the precision of its observation—a snapshot of a society both amused and bemused by its own reflection.