span><span class='period'>.</span><span class='id identifier rubyid_instance_of?'>instance_of?</span><span class='lparen'>(</span><span class='const'><span class='object_link'><a href="Colour.html" title="RRTF::Colour (class)">Colour</a></span></span><span class='rparen'>)</span>
      <span class='ivar'>@colours</span><span class='period'>.</span><span class='id identifier rubyid_push'>push</span><span class='lparen'>(</span><span class='id identifier rubyid_colour'>colour</span><span class='rparen'>)</sp