Ключевые слова: advise, assistance, blackboard, board, brainstorming, business, chalk, close, concept, creative, creativity, dark, decision, drawing, efficiency, expert, hand, idea, improvement, innovation, innovative, inspiration, invention, leader, leadership, lesson, marker, marketing, plan, presentation, problem, project, showing, sign, sketch, sketching, solution, solve, start, strategy, success, successful, support, teaching, text, think, up, vision, workshop, writing,