The dark dark shape at the bottom of the pool

We couldn’t make out exactly what it was,
The dark dark shape at the bottom of the pool.
Neil said he thought it was a chair because
He thought that the bar was missing a stool.

Sadly for us it was too far down
For any of us to investigate.
Emmet thought a ball, or a dressing gown.
“Doesn’t look like either to me,” said Kate.

Eventually we sought out Grandad’s advice
As to whether ‘twas a chair or gown or ball,
But though we went round the poolside twice
Alas! We could not find Grandad at all.