Perlin Noise only implements in one axis?

So I used the code from the tutorial here but my terrain looks completely different, as pictured. Have they changed how the perlin noise function works in Unity? Thanks.

SOLVED: I used child.transform.position.y instead of child.transform.position.z in the second value of the perlin noise function.

My Code:

 #pragma strict
 var size : int = 10;
 var cube : GameObject;
 var scale : float = 6.5;
 var move : boolean = false;
 
 function Start () {
     for(var x=0;x<size;x++){
         for(var z=0;z<size;z++){
             var c = Instantiate(cube, Vector3(x,0,z),Quaternion.identity);
             c.transform.parent = transform;    
         }
     }
     for(var child:Transform in transform){
         var height = Mathf.PerlinNoise(child.transform.position.x/scale,child.transform.position.y/scale);
         child.renderer.material.color = Color(height,height,height,height);
     }
 }
 
 function Update () {
     for(var child:Transform in transform){
         var height = Mathf.PerlinNoise(child.transform.position.x/scale,child.transform.position.y/scale);
         child.renderer.material.color = Color(height,height,height,height);
     }
     if(move == true){
         for(var child:Transform in transform){
             height = Mathf.PerlinNoise(child.transform.position.x/scale,child.transform.position.y/scale);
             child.transform.position.y = height;
         }
     }
 }