Asei Sentani - West Papua barks are unique arts form. They starts with a piece of bark that has been prised from the girth of KHAMBOUW tree. A scarce tree which just live in Sentani Lake. It's not all tree will be used for. It has to be less of branches and sufficient of its ages. When the criterias are matched, then it will be barked.

It's placed on the ground over smoldering bank of coals with the edges extended to a flattened configuration. Rocks are placed on the corners and edges to hold the bark down and flat while it cures.

After it has dried and is mostly flat, the stringy side of the barks is scraped to make it smooth. When it is completely flat and smooth, the surface is painted. The media are ground-up carbon (black), sagoo (white), clay (red), and other natural source for other color.
The applied patterns involve various designs and icons.  Spirals  symbolize  the swirl of Lake Sentani itself or so some claim; official art developers convinced tribal leaders to abolish traditional carving rights and restrictions on the use of motifs,  arguing  that  such  concerns  were  no longer relevant. Among contemporary bark cloth paintings produced by the Asei islanders of Lake Sentani, I noted several unusual pieces clearly combining Asmat Tribe and Sentani motifs.  The Asmat motifs were the bipane (boar tusk nosepiece symbol) and hornbill head, a crocodile or lizzard ( either Sentani or Asmat), Asmat human figures that transform into Sentani spirals motifs called FOUW and Sentani fish. Such a fusion is reminiscent of BATIK IRIAN JAYA,  yet the use of  Asmat  motifs by Sentani people for monetary gain goes against unspoken rules of conduct among many papuanese artists.
Numerous fish, including swordfish and sea turtles are often painted on a piece of bark cloth from Asei or an other local village from Lake Sentani . Fish and other water animals were often portrayed on bark cloth since bark cloth has traditionally been the clothing of the married woman and since, in the Sentani region, it is mostly women who catch the fish. Sentani Lake was an old sea inlet which had been separated from the ocean by volcanic eruption. This is the reason why sea fish such a swordfish occurs on the cloths. Traditionally, pieces of bark cloth were painted with patterns such wavy lines and spirals. The current style, characterized by separate figures that seem to float freely in space, is probably development of the 1920s and 1930s. Women have created bark clothes for centuries.
They called the painting as KHAMBOUW BARK PAINTING.
Asei is the only Island in Lake Sentani, West Papua, Indonesia.