Beautification of the environment

Project/Assets/ML-Agents/Examples/Sorter/Prefabs/Area.prefab

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Project/Assets/ML-Agents/Examples/Sorter/Scripts/NumberTile.cs

     private bool m_Visited = false;
     private MeshRenderer m_Renderer;
 
-    void Awake()
-    {
-        m_Renderer = GetComponentInChildren<MeshRenderer>();
-        ResetTile();
-    }
-
     public bool IsVisited
     {
         get { return m_Visited; }
 
     public void ResetTile()
     {
+        if (m_Renderer is null)
+        {
+            m_Renderer = GetComponentInChildren<MeshRenderer>();
+        }
         m_Renderer.sharedMaterial = DefaultMaterial;
         m_Visited = false;
     }