The Walking Minds are a sustainable and resource-saving advertising medium thanks to the rental concept.
Most components of the advertising medium are also reused.

To make the Walking Minds even more sustainable, customers can choose the "eco+++" option book.
The individual speech bubble print is not, as before, printed on recyclable material  , but the printing ink itself is also based on environmentally friendly latex. In the Eco+++ variant, the printed material is made from FSC-certified, recyclable, paper-based material. Eco+++ just.