A few years after The Four Seasons was installed, B.E. Dahlgren came to work at The Field Museum. Trained in dentistry, Dahlgren adapted the casting methods used in the making of false teeth to construct an oversized model of a mosquito for the American Museum in New York.
His success led Stanley Field, then Field Museum president, to lure him to Chicago in 1909 to head a facility for producing plant models of exacting fidelity.