Ключевые слова: architecture, arena, audience, background, blue, chair, competition, concert, design, empty, entertainment, event, folded, foldup seat, football, geometrical, geometry, green, line, modern, nobody, pattern, plastic, presentation, public, regular, regularity, repetition, row, seat, seating, shape, soccer, sport, stadium, stand, structure, symmetry, tribune, turquoise, up, white,