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A twist bends the strip between two slices into a saddle; its normal came from one corner's triangle, which leaned so far back that from about 60° of twist every wall was taken for facing away and dropped, leaving the front cap alone. Each strip now takes the whole quad's average normal (Newell's), as Inflate's facets do. A test checks the faces kept against each strip's average normal oriented away from the axis, for twists up to 300° and four views.