Empty Spaces Lyrics by Pink Floyd

[One Passage running backwards]:
“Congratulations, You have just discovered the secret message.
Please send your answer to ‘Old Pink’,
Care of the funny farm, Chalfont…” – (speaking Roger)
“Roger, Caroline’s on the phone…” ]

What shall we use
To fill the empty spaces
Where we used to talk?
How shall I fill
The final places?
How can I complete the wall