title: Axis Rotation Question
body: <p>By using left hand rule, I rotate one object left and right using y axis, and rotate up/down using x axis.
  After first object is rotated to the right, the up/down rotation should be using z axis.</p>
  
  <p>However, when I try to rotate using z axis, after the first rotation, it has the same effect when I rotate using y axis.</p>
  
  <p>Anyone has any ideas?</p>
  
  <p>Thanks</p>