#let poem(content) = {
  set par(first-line-indent: 0em)

  align(center, block[
    #set align(left)
    #set block(breakable: false)
    #content
  ])
}

#poem[
  #block[
    #h(1em)“‘First, the fish must be caught.' \
    That is easy: a baby, I think, could have caught it. \
    #h(1em)‘Next, the fish must be bought.' \
    That is easy: a penny, I think, would have bought it.
  ]

  #block[
    #h(1em)‘Now cook me the fish!' \
    That is easy, and will not take more than a minute. \
    #h(1em)‘Let it lie in a dish!' \
    That is easy, because it already is in it.
  ]

  #block[
    #h(1em)‘Bring it here! Let me sup!' \
    It is easy to set such a dish on the table. \
    #h(1em)‘Take the dish-cover up!' \
    Ah, that is so hard that I fear I'm unable!
  ]

  #block[
    #h(1em)For it holds it like glue--- \
    Holds the lid to the dish, while it lies in the middle: \
    #h(1em)Which is easiest to do, \
    Un-dish-cover the fish, or dishcover the riddle?”
  ]
]