diff --git a/src/vbl_aquarium/models/urchin.py b/src/vbl_aquarium/models/urchin.py
index 4d428d0..9af6236 100644
--- a/src/vbl_aquarium/models/urchin.py
+++ b/src/vbl_aquarium/models/urchin.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from enum import Enum
+
 from pydantic import Field
 
 from vbl_aquarium.models.unity import Color, Vector2, Vector3