[5] As a member of the Cercle, he took part in Scénographies Urbaines, (Urban Scenographies) in January 2003, an event and artist residency organized by the collective.

[6] The project was based out of the New Bell neighborhood of Douala where Yanguen resides, and aimed to help artists express themselves and engage in an exchange with the inhabitants of the district.

The workshop also involved Cercle Kapsiki (Hervé Youmbi, Hervé Yamguen, Blaise Bang, Salifou Lindou, Jules Wokam) collaborating with the Scur' k collective (J-C Lanquetin, François Duconseille) inviting other artists from Cameroon, France, Democratic Republic of the Congo and Lebanon, to come together and share details of their lives with the district's population.

[7] In 2003, Yamguen exhibited work at the Galerie Mam Art Contemporain within the framework of the project Pièce Unique, initiated by the French Cultural Center of Douala.

[7] He also published a long poem Le temps de la saison verte (The time of the green season), in 1998.

Recently, he was inducted as a dignitary in the village of his father (Bandja-Balassie in the upper Nkam), where he reconnects with the codes of the rituals and customs while maintaining his posture of contemporary artist.