In computer programming, an S-expression (or symbolic expression, abbreviated as sexpr or sexp) is an expression in a like-named notation for nested list (tree-structured) data. S-expressions were invented for and popularized by the programming language Lisp, which uses them for source code as well as data. wikipedia 
FUCHS, Peter, 2016. Der Fuss des Leuchtturms liegt im Dunkeln: eine ernsthafte Studie zu Sinn und Sinnlosigkeit. Weilerswist: Velbrück Wissenschaft. ISBN 978-3-95832-064-2. pdf
> Wherever a form is observable whose function is to enable new forms, this is third-order observation. Art (where the term was apparently first used), but also religion/pastoral care and psychotherapy can be interpreted as forms of form-finding.
Linear discussion only takes us so far. For a more intuitive, holistic experience put on skits, write songs together, do art, listen to poetry, experiment with movement. The arts can move and teach us, inspire and engage, bringing a group to places we would never otherwise reach.
DOT FROM two-level-diagram