ลูกบาศก์, กลุ่ม, เปิด, เรขาคณิต, ร่างกายกลวง, ช่องว่าง, มิติที่ 3, สามมิติ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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