canvas id="primitive--tetrahedron"></canvas>
                            <h4>Tetrahedron</h4>
                            <hr>
                            <p>Sandbox.Tetrahedron(size)</p>
                        </article>
                    </div>
                    <div class="card-wrap">
                        <article class="primitive--card">
                            <canvas id="primitive--cube"></canvas>
                            <h4>Cube</h4>
                            <hr>
                  