A flower with a cup

A flower with a cup
deep and with a rim
where come to rest
the weary and thirsty
my guests who are
and are invited inside
for a welcome drink.
Nature's cup is never empty
and bottomless is its pit
drink as much as you can
but the world is ever thirsty.
Come out of your houses large and big
what they are but cement, steel and concrete
why live in such a make believe world
when reality is full of dearth and need!