This suite of twelve watercolours by van Mäele shows that he was just as good an artist in this medium as he was in his mastery of etching. Created in the mid-1920s, almost certainly as a commission for a wealthy client, the portfolio is now in the collection of The Kinsey Institute for Research in Sex, Gender, and Reproduction, a research resource based at Indiana University in Bloomington.

Several of the paintings can be linked to similar engravings from earlier van Mäele works, suggesting that the client knew exactly which scenes were wanted in the commissioned portfolio.