Transforms an m-dimensional Rect using t, an nxn matrix that can
        transform vectors in the form: [x, y, z, …, 1].
        The Rect is padded to n dimensions.

def transformed(self, t):
        """
        Transforms an m-dimensional Rect using t, an nxn matrix that can
        transform vectors in the form: [x, y, z, …, 1].
        The Rect is padded to n dimensions.
        """
        assert t.shape[0] == t.shape[1]
        extra_dimensions = t.shape[0] - self.dimensions - 1

        def transform(a):
            return t.dot(np.concatenate(
                (a, [0] * extra_dimensions, [1]),
                axis=0
            ))[:self.dimensions]
        return Rect(transform(self.mins), transform(self.maxes))