Ko ngā peera roera porotaka kotahi-rārangi he wāhanga o te rōpū peera roera radial. Kei roto i ēnei peera he mowhiti o waho totoka, he mowhiti o roto, me ngā huinga huānga roera katoa. Nā te korenga o tētahi whare herehere, ka taea e te peera te whakauru i te maha rawa o ngā huānga roera.
