diff --git a/Acme/Colosson.hs b/Acme/Colosson.hs
new file mode 100644
--- /dev/null
+++ b/Acme/Colosson.hs
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+-- | Determines whether it is numberwang.
+module Acme.Colosson
+    ( numberwang
+    ) where
+
+import System.Random
+import System.IO.Unsafe
+
+data Wanger = Numb Bool Wanger Wanger
+
+simon :: Wanger -> Integer -> Bool
+simon (Numb b _ _) 0 = b
+simon (Numb _ x y) n = case divMod n 2 of
+    (m, 0) -> simon x m
+    (m, _) -> simon y m
+
+julie :: StdGen -> Wanger
+julie g0 =
+    let (b,  g1) = random g0
+        (g2, g3) = split  g1
+    in  Numb b (julie g2) (julie g3)
+
+colosson :: IO (Integer -> Bool)
+colosson = do
+    nt <- julie `fmap` newStdGen
+    pt <- julie `fmap` newStdGen
+    let f n | n < 0     = simon nt (-n)
+            | otherwise = simon pt n
+    return f
+
+-- | Is it numberwang?
+numberwang :: Integer -> Bool
+numberwang = unsafePerformIO colosson
+{-# NOINLINE numberwang #-}
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+Copyright (c) Keegan McAllister 2011
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the author nor the names of his contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,4 @@
+#! /usr/bin/runhaskell
+
+import Distribution.Simple
+main = defaultMain
diff --git a/acme-colosson.cabal b/acme-colosson.cabal
new file mode 100644
--- /dev/null
+++ b/acme-colosson.cabal
@@ -0,0 +1,20 @@
+name:                acme-colosson
+version:             0.1
+license:             BSD3
+license-file:        LICENSE
+synopsis:            Determines whether it is numberwang.
+category:            Acme
+author:              Keegan McAllister <mcallister.keegan@gmail.com>
+maintainer:          Keegan McAllister <mcallister.keegan@gmail.com>
+build-type:          Simple
+cabal-version:       >=1.2
+description:
+    Yes, that is a number!
+
+library
+  exposed-modules:
+      Acme.Colosson
+  ghc-options:      -Wall
+  build-depends:
+      base   >= 3 && < 5
+    , random >= 1.0