Treasure in Concrete

Once in a while, I am drawn by the idea of 'concrete' or 'shape' poetry where the arrangement of the text is evocative of the content, or is simply constrained by a formula as here where the number of letters per line progress from 1 to 8 and back again. For a true 'concrete' approach, this poem would, for example, be arranged in the shape of a cross, but the pattern was set as a challenge by my brother-in-law, and this is what I came up with...

X
is
the
spot
where
buried
pirates'
treasure
remains
hidden.
Quick!

Let's
dig
at
X