In front of the Satwiwa Native American Indian Culture Center in Rancho Sierra Vista/Satwiwa in Newbury Park is a replica Chumash home called an 'ap. An 'ap is shaped like half an orange and is made by setting willow poles in the ground in a circle, bending them into shape at the top to form a dome.
What is obviously missing from this 'ap is the outer, vertical layers, cattails laid out like shingles. The 'aps in the Chumash Indian Village at the Chumash Indian Museum in Thousand Oaks display what those look like.
There is a hole at the top of the 'ap to allow for air circulation that was covered with an animal skin when it was raining.
Funny that many folks, my kids included, wonder why the Chumash did not live in teepees (or tipis). Teepees are cone-shaped tents made of animal skins on wooden poles that were used primarily by Native Americans in the Great Plains section of the U.S. (Kansas, Nebraska, South Dakota, North Dakota and portions of other prairie states). The Chumash did not live in teepees.