diff --git a/src/bin/ponderosa-cpu.rs b/src/bin/ponderosa-cpu.rs
index b9e1017..d0e80e9 100644
--- a/src/bin/ponderosa-cpu.rs
+++ b/src/bin/ponderosa-cpu.rs
@@ -62,7 +62,7 @@ fn parse_rom(path: &String) -> io::Result<(state::Land, Vec<state::Rule>, HashMa
         let x_pos = rom_words.pop_front().unwrap();
         let y_pos = rom_words.pop_front().unwrap();
 
-        land.map.insert((x_pos % land.width, y_pos % land.height), value);
+        land.sow(&(x_pos, y_pos), value);
     }
 
     println!("World\n=====");
diff --git a/src/state.rs b/src/state.rs
index 88b96c0..d6c5cf0 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -83,6 +83,14 @@ impl Land {
 
         return self.semaphores.get_mut(position).unwrap();
     }
+
+    pub fn sow(&mut self, position: &(u16, u16), value: u16) {
+        self.map.insert((position.0 % self.width, position.1 % self.height), value);
+    }
+
+    pub fn reap(&mut self, position: &(u16, u16)) -> u16 {
+        self.map.insert((position.0 % self.width, position.1 % self.height), 0).unwrap_or(0)
+    }
 }
 
 pub type Rule = VecDeque<u16>;