These are the ASCIIsvg.js commands that generate the two spirals:

<script>
function drawPicture(){
  initPicture("figure1",-10,10,-10)
  axes()
  stroke = "red"
  a = []
  with (Math) 
    for (var i = 0; i < 10; i = i+0.1)
      a[a.length] = [i*cos(PI*i+PI/2), i*sin(PI*i+PI/2)]
  curve(a)

  initPicture("figure2")
  stroke = "green"
  a = []
  with (Math) 
    for (var i = 0; i < 10; i = i+0.1)
      a[a.length] = [i*cos(-PI*i+PI/2), i*sin(-PI*i+PI/2)]
  path(a)
}
function coordinates(id){
  var p = getPointer(id)
  setText(p[0].toFixed(2),"pointerX")
  setText(p[1].toFixed(2),"pointerY")
}
</script>