diff --git a/control/dev/depth_test.py b/control/dev/depth_test.py
new file mode 100644
index 0000000..7ab4a9b
--- /dev/null
+++ b/control/dev/depth_test.py
@@ -0,0 +1,139 @@
+#! /usr/bin/env python
+from __future__ import absolute_import
+from __future__ import print_function
+import string
+__version__ = '1.1.1.1'
+__date__ = '$Date: 2007/02/15 19:25:19 $'
+__author__ = 'Tarn Weisner Burton <twburton@users.sourceforge.net>'
+
+#
+# Ported to PyOpenGL 2.0 by Tarn Weisner Burton 10May2001
+#
+# This code was created by Richard Campbell '99 (ported to Python/PyOpenGL by John Ferguson 2000)
+#
+# The port was based on the PyOpenGL tutorial module: dots.py
+#
+# If you've found this code useful, please let me know (email John Ferguson at hakuin@voicenet.com).
+#
+# See original source and C based tutorial at http://nehe.gamedev.net
+#
+# Note:
+# -----
+# This code is not a good example of Python and using OO techniques.  It is a simple and direct
+# exposition of how to use the Open GL API in Python via the PyOpenGL package.  It also uses GLUT,
+# which in my opinion is a high quality library in that it makes my work simpler.  Due to using
+# these APIs, this code is more like a C program using function based programming (which Python
+# is in fact based upon, note the use of closures and lambda) than a "good" OO program.
+#
+# To run this code get and install OpenGL, GLUT, PyOpenGL (see http://www.python.org), and PyNumeric.
+# Installing PyNumeric means having a C compiler that is configured properly, or so I found.  For
+# Win32 this assumes VC++, I poked through the setup.py for Numeric, and chased through disutils code
+# and noticed what seemed to be hard coded preferences for VC++ in the case of a Win32 OS.  However,
+# I am new to Python and know little about disutils, so I may just be not using it right.
+#
+# BTW, since this is Python make sure you use tabs or spaces to indent, I had numerous problems since I
+# was using editors that were not sensitive to Python.
+#
+from OpenGL.GL import *
+from OpenGL.GLUT import *
+from OpenGL.GLU import *
+import sys
+
+# Some api in the chain is translating the keystrokes to this octal string
+# so instead of saying: ESCAPE = 27, we use the following.
+ESCAPE = b'\x1b'
+
+# Number of the glut window.
+window = 0
+
+# A general OpenGL initialization function.  Sets all of the initial parameters.
+def InitGL(Width, Height):				# We call this right after our OpenGL window is created.
+	glClearColor(0.0, 0.0, 0.0, 0.0)	# This Will Clear The Background Color To Black
+	glClearDepth(1.0)					# Enables Clearing Of The Depth Buffer
+	glDepthFunc(GL_LESS)				# The Type Of Depth Test To Do
+	glEnable(GL_DEPTH_TEST)				# Enables Depth Testing
+	glShadeModel(GL_SMOOTH)				# Enables Smooth Color Shading
+
+	glMatrixMode(GL_PROJECTION)
+	glLoadIdentity()					# Reset The Projection Matrix
+										# Calculate The Aspect Ratio Of The Window
+	gluPerspective(45.0, float(Width)/float(Height), 0.1, 100.0)
+
+	glMatrixMode(GL_MODELVIEW)
+
+# The function called when our window is resized (which shouldn't happen if you enable fullscreen, below)
+def ReSizeGLScene(Width, Height):
+	if Height == 0:						# Prevent A Divide By Zero If The Window Is Too Small
+		Height = 1
+
+	glViewport(0, 0, Width, Height)		# Reset The Current Viewport And Perspective Transformation
+	glMatrixMode(GL_PROJECTION)
+	glLoadIdentity()
+	gluPerspective(45.0, float(Width)/float(Height), 0.1, 100.0)
+	glMatrixMode(GL_MODELVIEW)
+
+# The main drawing function.
+def DrawGLScene():
+	# Clear The Screen And The Depth Buffer
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+	glLoadIdentity()					# Reset The View
+
+	#  since this is double buffered, swap the buffers to display what just got drawn.
+	glutSwapBuffers()
+
+# The function called whenever a key is pressed. Note the use of Python tuples to pass in: (key, x, y)
+def keyPressed(*args):
+	global window
+	# If escape is pressed, kill everything.
+	if args[0] == ESCAPE:
+		sys.exit()
+
+def main():
+	global window
+	# pass arguments to init
+	glutInit(sys.argv)
+
+	# Select type of Display mode:
+	#  Double buffer
+	#  RGBA color
+	# Alpha components supported
+	# Depth buffer
+	glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
+
+	# get a 640 x 480 window
+	glutInitWindowSize(640, 480)
+
+	# the window starts at the upper left corner of the screen
+	glutInitWindowPosition(0, 0)
+
+	# Okay, like the C version we retain the window id to use when closing, but for those of you new
+	# to Python (like myself), remember this assignment would make the variable local and not global
+	# if it weren't for the global declaration at the start of main.
+	window = glutCreateWindow("Jeff Molofee's GL Code Tutorial ... NeHe '99")
+
+   	# Register the drawing function with glut, BUT in Python land, at least using PyOpenGL, we need to
+	# set the function pointer and invoke a function to actually register the callback, otherwise it
+	# would be very much like the C version of the code.
+	glutDisplayFunc(DrawGLScene)
+
+	# Uncomment this line to get full screen.
+	#glutFullScreen()
+
+	# When we are doing nothing, redraw the scene.
+	glutIdleFunc(DrawGLScene)
+
+	# Register the function called when our window is resized.
+	glutReshapeFunc(ReSizeGLScene)
+
+	# Register the function called when the keyboard is pressed.
+	glutKeyboardFunc(keyPressed)
+
+	# Initialize our window.
+	InitGL(640, 480)
+
+	# Start Event Processing Engine
+	glutMainLoop()
+
+# Print message to console, and kick off the main to get it rolling.
+print("Hit ESC key to quit.")
+main()
\ No newline at end of file
diff --git a/control/draw_cude.py b/control/dev/draw_cude.py
similarity index 100%
rename from control/draw_cude.py
rename to control/dev/draw_cude.py
diff --git a/control/visual_servo.py b/control/dev/visual_servo.py
similarity index 100%
rename from control/visual_servo.py
rename to control/dev/visual_servo.py