His career was built on a foundation of disciplined training. Born in Winterthur, he moved from being a student under Heinrich Meyer to managing the drawing school of Johann Grimm. This transition from pupil to operator gave him a command over both the commercial and instructional sides of art. He did not merely create images; he established a workshop and a publishing company to ensure his vision reached a wider audience. His ability to train others, such as the engraver Adrian Zingg, proves that his influence was structural, rooted in the dissemination of precise technique rather than just individual talent.

Topography and the Swiss Eye

Aberli’s subject matter was dictated by geography. His interest in landscapes was sparked by travels through the Bernese Oberland in the mid-1740s, a period that grounded his work in the physical reality of the Swiss terrain. He possessed an eye for the specificities of Lake Geneva, Lake Biel, and Lake Neuchâtel. There is no romantic vagueness here; his depictions of places like Brienz and the Oberhaslital are characterized by topographical accuracy. He captured the weight of the mountains and the exact placement of water with a draftsman's certainty.

This commitment to the real was reinforced by his time in Paris in 1759. By studying the Old Masters in French museums and observing the engraving workshop of Johann Georg Wille, he refined his ability to translate light and texture onto paper. His travels through the Jura Mountains in 1774 further expanded this repertoire. Even when notable figures like Johann Wolfgang von Goethe visited him in Switzerland, they were encountering an artist focused on the tangible details of the landscape rather than abstract sentiment.

A Legacy of Technical Utility

The true measure of Aberli lies in his versatility across media. He operated successfully as a painter, etcher, draftsman, and printmaker. His output was diverse, ranging from portraits like Ursula Walther to detailed views of the Swiss countryside. While he found financial success through copper engravings, his watercolours remained a significant part of his professional output. He utilized various tools—black chalk, gouache, lead pen, and quill—to achieve different levels of detail.

His death in Bern in 1786 marked the end of an era of highly organized artistic production in the region. Although his business operations were continued by Heinrich Rieter, the specific technical identity he forged through the "Aberlische Manier" remained uniquely his. He left behind a body of work that functions as a precise visual record of 18th-century Swiss topography, stripped of unnecessary ornament and focused on the structural integrity of the land.