Ключевые слова: abstract, abstract symmetric guilloche, art, backdrop, background, banknote, business card, certificate, cheque, colored, coupon, cross, currency, curve, decorative, design, diploma, engraving, gray, guilloche, light, line, line art, lines, moire, money, multicolored, ornament, pale, paper, passport, pattern, protection, shape, soft, squiggle, squiggly, striped, strips, subtle, swirl, symmetry, teal, technology, template, texture, thin, ticket, turquoise, twist, undulating, voucher, warranty, watermark, wave, waveform, wavy, white, zigzag,