In my current studio house in Cologne, a concrete building, I feel uncomfortable. When I step out into the corridors, I experience a kind of cold shock. I arrived in Rheinau two days before the courses began. I used the quiet free evening to try out the two concrete paths that are laid out there for comparison. With the first path, it was immediately clear to me that this must be the Pneumatit path. I had the feeling that energy from the material flowed through my shoes and up into my legs. When I then switched to compare with the other path, it was confirmed. Because here, I clearly felt how normal concrete even absorbed energy. Also when trying two different pairs of similar concrete balls with and without Pneumatit, I was immediately sure which one had Pneumatit added to it. In both cases, I perceived the ball with Pneumatit as lighter – even where it was actually a little bit heavier. My impressions and experiences with Pneumatit will be passed on to concrete professionals and users.