 So, if one block is zoomed past the interaction threshold, all other blocks will
          be as well.</P>
        </BLOCKQUOTE>

        <H3>Painting Threshold</H3>

        <BLOCKQUOTE>
          <P>While zooming out (away from the blocks) you will eventually reach a point where
          contents each vertex will not be painted. Instead, each block will be painted by a
          rectangle that is painted with the current background color of the vertex.</P>
        </BLOCKQUOTE>
      </BLOCKQUOTE>

    