diff --git a/polymerist/maths/lattices/coordinates.py b/polymerist/maths/lattices/coordinates.py
index 0cc6f38..4e4f9ec 100644
--- a/polymerist/maths/lattices/coordinates.py
+++ b/polymerist/maths/lattices/coordinates.py
@@ -131,7 +131,8 @@ def linear_transformation(self, matrix : np.ndarray[Shape[N,N], float], as_coord
         transformed_points = self.points @ matrix.T # NOTE: need to right-multiply and transpose, since ROWS of self.points need to be tranformed 
 
         if as_coords:
-            return self.__class__(transformed_points)
+            # return self.__class__(transformed_points) # TOSELF: this form is more general, but doesn't play nicely with inheritance 
+            return Coordinates(transformed_points)
         return transformed_points
 
     def affine_transformation(self, matrix : np.ndarray[Shape[N,N], float], as_coords : bool=False) -> Union[np.ndarray[Shape[M, N], float], 'Coordinates']: # TOSELF: typehint on input matrix should be of shape N+1, N+1
@@ -142,7 +143,8 @@ def affine_transformation(self, matrix : np.ndarray[Shape[N,N], float], as_coord
         transformed_points = aug_transformed[: , :self.n_dims] / aug_transformed[:, self.n_dims, None] # downcast augmented transformed points from homogeneous coordinates, normalizing by projective part
 
         if as_coords:
-            return self.__class__(transformed_points)
+            # return self.__class__(transformed_points) # TOSELF: this form is more general, but doesn't play nicely with inheritance 
+            return Coordinates(transformed_points)
         return transformed_points
 
 
@@ -151,7 +153,7 @@ class BoundingBox(Coordinates):
     def __init__(self, coords : Union[Coordinates, np.ndarray[Shape[M, N], Num]]) -> None:
         if isinstance(coords, np.ndarray):
             coords = Coordinates(coords) # allow passing of Coordinates-like classes
-        points = np.array([vertex for vertex in cartesian_product(*self.extrema.T)])
+        points = np.array([vertex for vertex in cartesian_product(*coords.extrema.T)])
         
         super().__init__(points)