diff --git a/.env b/.env
index 4835dc7..7d91c38 100644
--- a/.env
+++ b/.env
@@ -1,4 +1,4 @@
 TASK_X_REMOTE_TASKFILES=1
-SOURCE_FOLDER=src/cvxball
+SOURCE_FOLDER=src/cvx
 TESTS_FOLDER=src/tests
 MARIMO_FOLDER=book/marimo
diff --git a/pyproject.toml b/pyproject.toml
index 2766a82..389a5f3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,6 @@ dependencies = [
     "plotly>=5.24.1",
     # Install solvers
     "clarabel>=0.9.0"
-
 ]
 
 [project.urls]
diff --git a/src/cvxball/__init__.py b/src/cvx/ball/__init__.py
similarity index 100%
rename from src/cvxball/__init__.py
rename to src/cvx/ball/__init__.py
diff --git a/src/cvx/ball/utils/circle.py b/src/cvx/ball/utils/circle.py
new file mode 100644
index 0000000..6c36373
--- /dev/null
+++ b/src/cvx/ball/utils/circle.py
@@ -0,0 +1,24 @@
+from dataclasses import dataclass
+
+import numpy as np
+import plotly.graph_objects as go
+
+
+@dataclass(frozen=True)
+class Circle:
+    center: np.ndarray
+    radius: float
+
+    def scatter(self, num=100, color="red"):
+        t = np.linspace(0, 2 * np.pi, num=num)
+        radius = self.radius
+        circle_x = self.center[0] + radius * np.cos(t)
+        circle_y = self.center[1] + radius * np.sin(t)
+
+        return go.Scatter(
+            x=circle_x,
+            y=circle_y,
+            mode="lines",
+            line=dict(color=color, width=2),
+            name=f"Circle(r = {self.radius})",
+        )
diff --git a/src/cvx/ball/utils/cloud.py b/src/cvx/ball/utils/cloud.py
new file mode 100644
index 0000000..110b89e
--- /dev/null
+++ b/src/cvx/ball/utils/cloud.py
@@ -0,0 +1,17 @@
+from dataclasses import dataclass
+
+import numpy as np
+import plotly.graph_objects as go
+
+
+@dataclass(frozen=True)
+class Cloud:
+    points: np.ndarray
+
+    def scatter(self, size=10):
+        return go.Scatter(
+            x=self.points[:, 0],
+            y=self.points[:, 1],
+            mode="markers",
+            marker=dict(symbol="x", size=size, color="blue"),
+        )
diff --git a/src/cvx/ball/utils/figure.py b/src/cvx/ball/utils/figure.py
new file mode 100644
index 0000000..06a8709
--- /dev/null
+++ b/src/cvx/ball/utils/figure.py
@@ -0,0 +1,18 @@
+import plotly.graph_objects as go
+
+
+def create_figure():
+    # Create the scatter plot
+    fig = go.Figure()
+
+    # Update layout for equal aspect ratio and axis labels
+    fig.update_layout(
+        xaxis_title="x",
+        yaxis_title="y",
+        yaxis=dict(
+            scaleanchor="x",
+            scaleratio=1,
+        ),
+    )
+
+    return fig
diff --git a/src/cvxball/add.py b/src/cvxball/add.py
deleted file mode 100644
index e6eeeb1..0000000
--- a/src/cvxball/add.py
+++ /dev/null
@@ -1,28 +0,0 @@
-#    Copyright 2025 Stanford University Convex Optimization Group
-#
-#    Licensed under the Apache License, Version 2.0 (the "License");
-#    you may not use this file except in compliance with the License.
-#    You may obtain a copy of the License at
-#
-#        http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS,
-#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#    See the License for the specific language governing permissions and
-#    limitations under the License.
-#    Copyright 2023 Stanford University Convex Optimization Group
-#
-#    Licensed under the Apache License, Version 2.0 (the "License");
-#    you may not use this file except in compliance with the License.
-#    You may obtain a copy of the License at
-#
-#        http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS,
-#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#    See the License for the specific language governing permissions and
-#    limitations under the License.
-def add(x, y):
-    return x + y
diff --git a/src/tests/conftest.py b/src/tests/conftest.py
deleted file mode 100644
index a97d87b..0000000
--- a/src/tests/conftest.py
+++ /dev/null
@@ -1,26 +0,0 @@
-#    Copyright 2025 Stanford University Convex Optimization Group
-#
-#    Licensed under the Apache License, Version 2.0 (the "License");
-#    you may not use this file except in compliance with the License.
-#    You may obtain a copy of the License at
-#
-#        http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS,
-#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#    See the License for the specific language governing permissions and
-#    limitations under the License.
-"""global fixtures"""
-
-from __future__ import annotations
-
-from pathlib import Path
-
-import pytest
-
-
-@pytest.fixture(scope="session", name="resource_dir")
-def resource_fixture():
-    """resource fixture"""
-    return Path(__file__).parent / "resources"
diff --git a/src/tests/test_solver.py b/src/tests/test_solver.py
new file mode 100644
index 0000000..63b1785
--- /dev/null
+++ b/src/tests/test_solver.py
@@ -0,0 +1,17 @@
+import numpy as np
+
+from cvx.ball.solver import min_circle_cvx
+from cvx.ball.utils.cloud import Cloud
+from cvx.ball.utils.figure import create_figure
+
+
+def test_random():
+    p = np.array([[2.0, 4.0], [0, 0], [2.5, 2.0]])
+    cloud = Cloud(p)
+    circle = min_circle_cvx(p, solver="CLARABEL")
+
+    fig = create_figure()
+    fig.add_trace(circle.scatter())
+    fig.add_trace(cloud.scatter())
+
+    # fig.show()
diff --git a/src/tests/test_trivial.py b/src/tests/test_trivial.py
deleted file mode 100644
index 6c03a7d..0000000
--- a/src/tests/test_trivial.py
+++ /dev/null
@@ -1,18 +0,0 @@
-#    Copyright 2025 Stanford University Convex Optimization Group
-#
-#    Licensed under the Apache License, Version 2.0 (the "License");
-#    you may not use this file except in compliance with the License.
-#    You may obtain a copy of the License at
-#
-#        http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS,
-#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#    See the License for the specific language governing permissions and
-#    limitations under the License.
-from cvxball.add import add
-
-
-def test_add():
-    assert add(2, 3) == 5