ลูกบอล, เหล็ก, fractals, เรขาคณิต, กราฟิก, พื้นหลัง, บทคัดย่อ, สีเหลือง, ดินเหลืองใช้ทำสี, คณิตศาสตร์, โครงสร้างเศษส่วน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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