diff --git a/lecture_03/assignment_02/HangZhang-JingwenWang/assignment02.py b/lecture_03/assignment_02/HangZhang-JingwenWang/assignment02.py
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+"""Assignment 02: Build your own robot model
+"""
+from compas.utilities import pairwise
+from compas.artists import Artist
+from compas.datastructures import Mesh
+from compas.geometry import Circle
+from compas.geometry import Cylinder
+from compas.geometry import Frame
+from compas.geometry import Plane
+from compas.geometry import Translation
+from compas.geometry import Point, Vector
+from compas.robots import Configuration
+from compas.robots import Joint
+from compas.robots import RobotModel
+import random
+import math
+
+### The goal of this script is to create Logarithmic spiral shape
+### Author: Jingwen Wang & Hang Zhang
+### 2022.03.13
+
+# create robot model
+model = RobotModel("robot", links=[], joints=[])
+
+# record all the parameters
+a, b = 1, 0.2
+point = Point(0,0,0)
+theta = 0.4 * math.pi
+length_list = [] #n-1
+point_list = [] #n
+vector_list = [] #n-1
+n = 20 #number of segments
+
+for i in range(n):
+    r = a*math.pow(math.e,b*(i+1)*theta)
+    new_point = Point(r*math.cos((i+1)*(theta)), r*math.sin((i+1)*(theta)),0)
+    if i!=0:
+        vector = new_point - point
+        length_list.append(vector.length)
+        vector_list.append(vector)
+    point = new_point
+    point_list.append(new_point)
+
+#Create links
+link_list = [] #n
+link_list.append(model.add_link("world"))
+
+for i,length in enumerate(length_list):
+    radius = 0.3
+    cylinder = Cylinder(Circle(Plane([0, 0, 0], [1, 0, 0]), radius), length)
+    cylinder.transform(Translation.from_vector([length / 2.0, 0, 0]))
+    mesh = Mesh.from_shape(cylinder)
+    #mesh_list.append(mesh)
+    link_list.append(model.add_link("link"+str(i), visual_mesh=mesh, visual_color=(random.random(), random.random(), random.random())))
+
+#Create joints
+angle_list = []
+angle_list.append(0.0) #n-2
+
+axis = (0, 0, 1)
+#add the world list
+origin = Frame.worldXY()
+model.add_joint("joint0", Joint.CONTINUOUS, link_list[0], link_list[1], origin, axis)
+
+#iterate through n-2 times
+for i, (vector1,vector2) in enumerate(pairwise(vector_list)):
+    angle_list.append(vector1.angle(vector2))
+    origin = Frame((length_list[i], 0, 0), (1, 0, 0), (0, 1, 0))
+    model.add_joint("joint"+str(i+1), Joint.CONTINUOUS, link_list[i+1], link_list[i+2], origin, axis)
+
+# Create a configuration object matching the number of joints in your model
+configuration = model.zero_configuration()
+configuration.joint_values = angle_list
+
+# Update the model using the artist
+artist = Artist(model)
+artist.update(configuration)
+
+# Render everything
+artist.draw_visual()
+artist.redraw()