Ключевые слова: abstract, adult, baby, banner, black board, blakboard, chalk board, closeup, color, cost, cover, creative, diagram, drawing, element, figure, geometric, hand, hold, holding, montessori, nested, nesting, non verbal, number 2, progression, puzzle, quality, rainbow, schematics, sensory, sequence, shape, stack, stacking, text, time, toy, triangle, vibrant, white background, wooden,