Ключевые слова: borderline, city, concept, distance, epidemic, feet, floor, gray, grunge, isolation, limit, line, lockdown, material, message, outdoor, pattern, pavement, people, person, prevention, protection, public, quarantine, red, risk, rough, safe, safety, shoes, sign, social, social distancing, standing, stay, stay safe, stop, stop line, street, symbol, text, texture, textured, two, urban, view, virus, waiting, warning, way,