After his series of portraits with crazy hats produced for the largest screen print in Belgium, Bruneau continued working on various series of drawings about, among other things, clothing. Bruneau had long entertained the idea of putting together a world encyclopedia consisting exclusively of images. He enthusiastically drew portraits of different types of humans, such as the 'Chinois' series. Also, milkmaids, nose-pickers, pin-ups, cowboys, Indians, chairs, famous couples, shoes, people in uniforms, and his well-known series of writers would become part of this visual encyclopedia of humanity.

In 1991, Bruneau and his then-gallerist Christ Delaet caused a sensation. In May of that year, they presented the largest screen print in Belgium (202 X 160 cm). The screen print consisted of a collage of 45 portraits with a hat. The screen print was titled 'Mad as a hatter'. This English expression refers to very eccentric, insane, unpredictable, or inappropriate behavior. In the 18th and 19th centuries, a large proportion of hatters displayed strange neurological symptoms resulting from mercury poisoning during the processing of wool into felt. A copy of the screen print can be seen at the exhibition at Wolstraat 33.