The key words to this flat (ONE and TWO) are homophones. ONE is a single word, while TWO is made of two words. 

Under the hand of the sculptor did

   flow, 

Lovely and graceful, a dancer on toe.

He'd expertly dealt with a ONE in the 

   wood

By fitting his pattern to go where it 

   could.

Still, the piece suffered; in fact it is 

   TWO.

Grain under strain broke an ear off - - -

   got glue?

 

Answers:

 

ONE = KNOTHOLE

TWO = NOT WHOLE

 

Credit:

The Enigma 

NPL Magazine

March, 2021

A. CHEMEM