(0) SimpleReservoir

  ┌───←──┨ Delay el. ┠──←───┐
  │↓                        │↑
→─⊕─→──┨ Nonlinear el. ┠──→─┴─→

Nonlinear element

(1) NonlinearElement

Delay element

(2) FreeSpace

─→┨  ┠─→