The manufacture technique permitting, the next development is the figure itself that is hollow and pierced. The figures represent living creatures, such as people or animals. No figures representing women explicitly have been found.
In the oldest representations pictures of devils are rare, except for that of Kircher (1654), whose intention was to give a religious meaning together with the angels, just as he stated in his texts. Well into the 18th century and mainly in the 19th, they were more common.
It is important to remember some cases in which the perforation ends in a hollow tube that goes around the main part of the figure, although it doesn’t represent devils or satyrs’ images. These are the cases of Wolff (1722), Desaguliers (1744), Robison (1822), Tissandier (1885) and Henner (1760) (plate 51).
In Wolf (1768) and Schulz (1824), the hollow tube cannot be seen in the representation, but the text is explicit.
In these cases it is clear that, besides moving up and down, the little devil will turn when it expels water through the tube.