I had no idea which path was with and which one was without Pneumatit. Concrete Test Facility in Rheinau The Pneumatit AG had created a small, publicly accessible concrete garden in Rheinau. In duplicate, there were side by side for testing: one concreted path, a small square with a stele and a sitting sphere on it – once with, once without Pneumatit®. A short introduction was attached to a third stele. The solution ("Which is with, which is without Pneumatit®?") was visible concealed on the opposite side of the street. – The test facility had to be removed for maintenance reasons. When I stepped from the street onto the first path, I initially thought that this must be the Pneumatit path because its surface is so fine, finer than that of the street. However, when I stepped over to the second path, which has the same surface, it immediately became clear to me that my assumption was wrong: this was the Pneumatit path – the second one! I then repeatedly stepped from one path to another and back again, and my impression remained consistent. The experience of difference was most pronounced right after switching from one path to another: On normal concrete, I felt full of unrest; there always seemed like something else needed doing; I felt stressed. On the Pneumatit path however, I felt comfortable. It made me feel relaxed all through my stomach and experienced peace and a lot of space without feeling like needing to do anything special. After about ten minutes of trying out both paths, I went to check which one is what. Although curious about it but deep down inside already sure.