My first is in blue, but not in glue;
My second is in old but not in new;
My third in look but not in see
My last in ask but not in pea
My whole has leaves but not a flower
"Twill help you pass an idle hour.
At a glance it appears that the slope lines are not straight lines. The top figure has a sag in it and the lower figure has a crest in it. The difference is slight but that little difference would make up the difference in areas between the two.
