Anishinaabe Arcs: Background 4: structures
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Some structures used one arc: snowshoes, bows, lacrosse sticks, dreamcatchers, cradleboards, and basket rims. But the most complex structures contained many arcs put together:

The longhouse also has arcs along two axes, but its layout is a long rectangle (up to 150 feet!) with semi-circle ends. Many people would live together. Just as the wiigwam structure can also be used for religious architecture (sweat lodge) the longhouse structure can also be built for ceremonial purposes.

Canoes only have arcs across one axis, but the arcs have to change shape (not height), as you go towards the bow.