For every week of the year, the "Improvisation calendar" contains one sheet with a graphic illustration intended to provoke improvisation. This improvisation can be played on any instrument, even the voice can be used. On the sheets, you will find anything from situations to notes and pictures open to associations. Opening words in German, English, Dutch, Japanese, Spanish and French precede the graphic part. Offerman offers tips and rules for using the calendar which can be hung up on the wall ...