fractals, พื้นหลัง, ไฟเบอร์กลาส, คู่มือแสง, คณิตศาสตร์, สีดำ, สีน้ำเงิน, บทคัดย่อ, เรขาคณิต, เกลียว, การกระทำ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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