This is a signal design for the metro system and railroads of Rocaterrania. Also pictured is a fuel pressure gauge design from the driving compartment of the Oriental, the eastbound Metro train.
Kuhler himself was a Luddite of sorts (“urban Amish,” as he put it), so Rocaterranians lived in a society where technology, for the most part, had not progressed beyond the Victorian era. When he became a scientific illustrator at the North Carolina Museum of Natural Sciences, he enjoyed playfully merging nature with technology in some of his personal illustrations (e.g., a submarine designed to look like a fish). He also had a gift for creating visual analogies, as evidenced in this illustration.
Vintage British railroad signals. Parking meters. Bird specimens an ornithology office at the North Carolina Museum of Natural Sciences where Kuhler worked as a scientific illustrator.