Traunreut started as a Second World War ammunition depot whose buildings were emptied and re-used as housing by refugees. In a short period of time, the old stores were rebuilt and new housing created; in 1949, the electrics firm Siemens built a factory at the edge of the new settlement. When Traunreut  built its town hall a quote by a well – known writer was used in the fresco that Sperl created. It said "If there is a belief that can move mountains, it is the belief in ones own power." The Church and Christian Party objected. The fresco has since been removed.

Numerous commissions for murals on public buildings, schools, banks, businesses in the area followed:

 Draft, Watercolour, 35x47

                                                 

School, Reit im Winkel