--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ch7ex2.py	Thu Jul 25 21:53:44 2013 -0500
@@ -0,0 +1,26 @@
+"""Chapter 7, exercise 2 in Allen Downey's Think Complexity book.
+
+Start with an r-pentomino as an initial condition and confirm that the results
+are consistent with the description above. You might have to adjust the size of
+the grid and the boundary behavior.
+
+"""
+import Life
+
+
+class RPentomino(Life.Life):
+
+    def __init__(self, n):
+        super(RPentomino, self).__init__(n, mode='constant', cval=0, random=False)
+
+        i, j = n / 2, n / 2
+        self.array[i, j] = 1
+        self.array[i, j - 1] = 1
+        self.array[i, j + 1] = 1
+        self.array[i - 1, j] = 1
+        self.array[i + 1, j - 1] = 1
+
+if __name__ == '__main__':
+    life = RPentomino(150)
+    viewer = Life.LifeViewer(life, delay=1)
+    viewer.animate(steps=1200)