When the inner-German border was established, West Germans attached leaflets, magazines and later books to gas-filled balloons fitted with a timer mechanism that dropped them into the GDR when the wind was favourable. Without any context the balloons could be many things: a child's plaything, land art, a performative installation, a meteorological measuring instrument, or a means of broadcasting political concerns. The book juxtaposes pictures from the Stasi archives with texts in the form of logs documenting the flights of the transport balloons.