diff --git a/graphics/center_of_mass.jl b/graphics/center_of_mass.jl
index 448b492..fd37944 100644
--- a/graphics/center_of_mass.jl
+++ b/graphics/center_of_mass.jl
@@ -15,14 +15,14 @@ A = -0.9 * L
 B = 0.65 * L
 pr = 0.03 * L
 
-Ap_array = project_to_unit_circle(A, L)
-Bp_array = project_to_unit_circle(B, L)
-for p in (Ap_array, Bp_array)
+Ap_vec = Vector(project_to_unit_circle(A, L))
+Bp_vec = Vector(project_to_unit_circle(B, L))
+for p in (Ap_vec, Bp_vec)
     p[2] *= -1
 end
 
-Ap = Point(Ap_array)
-Bp = Point(Bp_array)
+Ap = Point(Ap_vec[1], Ap_vec[2])
+Bp = Point(Bp_vec[1], Bp_vec[2])
 
 M = R * ((Ap + Bp) / 2)