The natural modelThe sacred Lotus flower (see figure) is revered as a symbol of purity in Asian religions. Even emerging from muddy waters it unfolds its leaves unblemished and untouched by pollution.
This phenomenon of self-cleaning has been thoroughly researched and gives us a fascinating glimpse of what nature can do to protect itself from omnipresent dirt and pathogenic organisms.
By applying this property to technical surfaces almost every material in the open air can be cleansed by rain.
