You’ll see plenty of flexible pole tents on site today. The basic shape bends a flexible pole into a half circle with both ends fixed to a strong tape or webbing strap running across the base of the tent, often as part of the groundsheet.
Two flexible poles crossing in the middle give a square dome, three poles a hexagon. The sides are more vertical so overall headroom is better across a wider floor area. Stability is good in smaller models but, unlike the ridge tent, domes can get less stable as they scale up in size.