Graduated

a graduated cylinder,
the opening like a test tube, offering a small opening
for chopped carrots, some raisins and a few M&Ms,
but then still narrow all the way down, to collect
some rainwater and bits and pieces of knowledge,
there is nothing graduated about it, no widening of the
area, just more of the same, from what does it graduate,
from where to where, from what to what and where is
there room to grow in breadth and width, I ask myself,
what lesson is there for the graduate in this simple
cylinder.