Concrete poetry

I've been trying to write a poem in the shape of an oar. It has kept me pretty busy.

Although I've known about concrete poetry for many years, I haven't every really tried it (except for a very old poem about a staircase in the shape of stairs going up, but how challenging is that?). Then for my last National Poetry Month prompt ("write a poem about endings"), I ended up with this:

Not Such an End

Like an anchor in a sea
of dirt, it stays, resists
all my pulling, my
implements, red
handles and rust.
I hold the green
and leafy top
while, no bigger
than my thumb,
the end of the tap
root weds the wet
ground, its plant
memory
ready
to grow,
flower
again
gold.

How about you? Have you tried writing concrete poems?