diff --git a/flake.nix b/flake.nix
index ff4f3e2..336b83d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,6 +21,8 @@
             unzip
             texlive.combined.scheme-full
             imagemagick
+
+            (python310.withPackages (p: with p; [ numpy ]))
           ]) ++ (with toolchain; [
             cargo
             rustc
diff --git a/participation/2023-02-01.py b/participation/2023-02-01.py
new file mode 100644
index 000000000..d1ecbf5
--- /dev/null
+++ b/participation/2023-02-01.py
@@ -0,0 +1,29 @@
+import numpy as np
+
+I_lambda = np.array([1, 0, 0])
+I_dc_lambda = np.array([0, 0, 0])
+
+a_min = 0.0
+a_max = 1.0
+
+d_near = 1.0
+d_far = 21.0
+
+eye = np.array([0, 0, 0])
+
+def dist(a, b):
+    return np.linalg.norm(b - a, 2)
+
+def a_dc(d_obj):
+    if d_obj < d_near: return a_max
+    elif d_obj > d_far: return a_min
+    return a_min + (a_max - a_min) * (d_far - d_obj) / (d_far - d_near)
+
+def get_color(point):
+    d_obj = dist(eye, point)
+    I_lambda_prime = a_dc(d_obj) * I_lambda + (1 - a_dc(d_obj)) * I_dc_lambda
+    return I_lambda_prime
+
+print(get_color(np.array([1, 0, 0]))) # [1, 0, 0]
+print(get_color(np.array([5, 0, 0]))) # [0.8, 0, 0]
+print(get_color(np.array([20, 0, 0]))) # [0.05, 0, 0]