diff --git a/SimPEG/mesh/QuadTreeMesh.py b/SimPEG/mesh/QuadTreeMesh.py
index 6fe6189d..1ac0f5eb 100644
--- a/SimPEG/mesh/QuadTreeMesh.py
+++ b/SimPEG/mesh/QuadTreeMesh.py
@@ -1,5 +1,7 @@
 from SimPEG import np, sp, utils
 import matplotlib.pyplot as plt
+import matplotlib.colors as colors
+import matplotlib.cm as cmx
 
 
 
@@ -33,7 +35,7 @@ class TreeFace(object):
         self.mesh = mesh
         self.children = None
         self.numFace = None
-        self.x0 = np.array(x0,dtype=float)
+        self.x0 = np.array(x0, dtype=float)
         self.faceType = faceType
         self.sz = sz
         self.dim = dim
@@ -95,9 +97,9 @@ class TreeNode(object):
 
         self.mesh = mesh
         self.x0 = np.array(x0, dtype=float)
+        self.sz = np.array(sz, dtype=float)
         self.dim = dim
         self.depth = depth
-        self.sz = np.array(sz, dtype=float)
         self.parent = parent
         self.children = None
         self.numCell = None
@@ -181,19 +183,11 @@ class TreeNode(object):
     def vol(self): return self.sz.prod()
 
 
-    def viz(self, ax, text=True):
-        if self.isleaf:
-            x0, sz = self.x0, self.sz
-            corners = np.c_[np.r_[x0[0]      , x0[1]      ],
-                            np.r_[x0[0]+sz[0], x0[1]      ],
-                            np.r_[x0[0]+sz[0], x0[1]+sz[1]],
-                            np.r_[x0[0]      , x0[1]+sz[1]],
-                            np.r_[x0[0]      , x0[1]      ]].T
-            ax.plot(corners[:,0],corners[:,1], 'b')
-            if self.numCell is not None and text:
-                ax.text(x0[0]+sz[0]/2,x0[1]+sz[1]/2,'%d'%self.numCell)
-        else:
-            [node.viz(ax) for node in self.children.flatten('F')]
+    def viz(self, ax, color='none', text=False):
+        if not self.isleaf: return
+        x0, sz = self.x0, self.sz
+        ax.add_patch(plt.Rectangle((x0[0], x0[1]), sz[0], sz[1], facecolor=color, edgecolor='k'))
+        if text: ax.text(self.gridCC[0],self.gridCC[1],self.numCell)
 
 
 
@@ -206,6 +200,7 @@ class QuadTreeMesh(object):
         self.faceY = set()
         self.cells = set()
         self.x0 = np.array(x0,dtype=float)
+        self.h = h
         self.children = np.empty([hi.size for hi in h],dtype=TreeNode)
         for i in range(h[0].size):
             for j in range(h[1].size):
@@ -242,11 +237,9 @@ class QuadTreeMesh(object):
 
         self.isNumbered = True
 
-    def viz(self, ax=None, text=True):
-        if ax is None: ax = plt.subplot(111)
-        # [node.viz(ax, text=text) for node in self.cells]
-        [node.viz(ax, text=text) for node in self.faces]
 
+    @property
+    def dim(self): return len(self.x0)
     @property
     def nC(self): return len(self.cells)
     @property
@@ -291,6 +284,28 @@ class QuadTreeMesh(object):
         return self._faceDiv
 
 
+    def plotGrid(self, ax=None, text=True, plotC=True, plotF=False):
+        if ax is None: ax = plt.subplot(111)
+
+        if plotC: [node.viz(ax, text=text) for node in self.cells]
+        if plotF: [node.viz(ax, text=text) for node in self.faces]
+        ax.set_xlim((self.x0[0], self.h[0].sum()))
+        ax.set_ylim((self.x0[1], self.h[1].sum()))
+
+
+    def plotImage(self, I, ax=None):
+        if ax is None: ax = plt.subplot(111)
+        jet = cm = plt.get_cmap('jet')
+        cNorm  = colors.Normalize(vmin=I.min(), vmax=I.max())
+        scalarMap = cmx.ScalarMappable(norm=cNorm, cmap=jet)
+        ax.set_xlim((self.x0[0], self.h[0].sum()))
+        ax.set_ylim((self.x0[1], self.h[1].sum()))
+        for ii, node in enumerate(self.sortedCells):
+            node.viz(ax=ax, color=scalarMap.to_rgba(I[ii]))
+        scalarMap._A = []  # http://stackoverflow.com/questions/8342549/matplotlib-add-colorbar-to-a-sequence-of-line-plots
+        plt.colorbar(scalarMap)
+
+
 
 if __name__ == '__main__':
     M = QuadTreeMesh([np.ones(x) for x in [4,10]])
@@ -308,9 +323,16 @@ if __name__ == '__main__':
     M.refine(function)
 
     DIV = M.faceDiv
-    plt.subplot(211)
-    plt.spy(DIV)
+    # plt.subplot(211)
+    # plt.spy(DIV)
+    M.plotGrid(ax=plt.subplot(111),text=True)
 
-    M.viz(ax=plt.subplot(212),text=False)
+    q = np.zeros(M.nC)
+    q[208] = -1.0
+    q[291] = 1.0
+    b = utils.Solver(-DIV*DIV.T).solve(q)
+    plt.figure()
+    M.plotImage(b)
     # plt.gca().invert_yaxis()
+    print M.vol
     plt.show()