(While tracing up that stream from where I found myself I encountered the following):

! --------------------------------
! sine seeking computer generation
! --------------------------------
FOR t=0 to INF step .01
  x=4*SIN(2*t-PI/2)
  y=SIN(3*t+PI/2)
  PLOT x,y
NEXT t

(Tracing farther still reveals...):

! --------------------------------
! a pure river of water of life,
!    clear as crystal,
!    proceeding out of...
! --------------------------------
FOR t=0 to INF step .01
  x=4*SIN(t-PI)
  y=SIN(2*t+PI)
  PLOT x,y
NEXT t

(Any relation between Descartes' Analytic
Geometry and the figures produced is
merely coincidental!)