Pettersson’s 10th Symphony (duration 25’) contains very reduced material. Signals or vectors are used to condense, obeying strict mathematical and technical principles. Increasing the flow velocity in the middle section causes a transition to turbulence and chaos. The turning point in the last part represents a dream state, before the final Coda repeats the material extremely compacted. The symphony has autobiographical elements and describes Pettersson’s traumatic nine-month hospital stay. The sterile, mechanized and ruthless world, characterized by devices, threatens the man to fail.