There's a company making a product called Lotusan, which mimics -- when the building facade paint dries, it mimics the bumps in a self-cleaning leaf, and rainwater cleans the building.
Kāds uzņēmums ražo produktu vārdā Lotusan, kas, šai fasādes krāsai nožūstot, imitē pašattīrošās lapas izaugumus, ļaujot lietus ūdenim nomazgāt ēku.