Commit 3100c4b

@@ -4,9 +4,17 @@ class Printer
   end
 
   def display(world)
+    clear
     world.each_with_index do |cell, index|
       print cell.alive? ? "X" : " "
       puts if (index+1) % @max_x == 0
     end
+    sleep 1
+  end
+
+  private
+
+  def clear
+    puts "\e[H\e[2J"
   end
 end