A-Frame Course - Source of /examples/0100-primitives-07-nesting.html

<!DOCTYPE html>
<html>
  <head>
    <title>Primitives - 07 - Nesting</title>
    <script src="https://aframe.io/releases/1.4.0/aframe.min.js"></script>
  </head>
  <body>
    <a-scene>
      <a-circle position="2 2.6 -4" radius="1.5" color="#0074D9">
        <a-sphere position="1.5 0 0" radius="0.1" color="red"> </a-sphere>
      </a-circle>

      <a-sky color="gray"></a-sky>
    </a-scene>
  </body>
</html>