Possible Clues:

• Low wall panel
• Unusual to go back around a stretch of wall
• Having nothing on, relative in strip running round room
• Oxygen needed by relative that runs all round the room
• Lower part of a wall, differently decorated
• Panel gives old man nothing
• Pop over border
• Lower part of an inside wall, finished differently from the rest
• Groove for receiving the end of a board
• Lower part of an inside wall