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Music
The piece of music on this page translates via Messiaen's musical alphabet to give "épées de feu", French for "swords of fire", part of a quote by Messiaen (see Music). There's therefore a grey dashed line linking this to the logo of the Essex County Fire and Rescue Service - a fire brigade with swords as a logo.
Birds
The birds on this page correspond to letters in a code where the right facing birds represent A to M in the order of Catalogue d'oiseaux, and the left facing birds represent N to Z in the reverse order (see the Birds page). This is hinted at by the image on the card: two Alpine choughs facing each other across and an ellipsis, which translates as "A ... Z". Translated in this way, the code reads:
- ADDSENDERTOSTAMP
i.e.
- ADD SENDER TO STAMP
These are instructions to be carried out with the information on the Postcards.