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Various finger techniques (Le Monde illustré 14 January 1893)
Various finger techniques (Le Monde illustré 14 January 1893)
Finger whistling
Finger whistling
The groundhog makes a whistling sound as an alarm call.
The groundhog makes a whistling sound as an alarm call.
Spectators whistling during the Volleyball French Cup
Spectators whistling during the Volleyball French Cup
The air is blown between the thumbs into the hand.
The air is blown between the thumbs into the hand.
The thumb knuckles are put on the lips.
The thumb knuckles are put on the lips.