Ключевые слова: abstract, attack, background, billboard, black, blackboard, blank, board, chalk, chalkboard, classroom, coach, communication, concept, diagram, direction, distressed, drawing, education, empty, field, football, frame, game, grunge, inspiration, instruction, learning, noticeboard, old, plan, planning, player, school, smudged, soccer, space, sport, strategy, surface, tactics, team, teamwork, texture, textured, training, wall, winning,