บันไดวน, หอยทาก, ปล่องบันได, บันได, ภูมิหลัง, เกลียว, บทคัดย่อ, แบบแผน, ใกล้ชิด, รูปร่าง, ออกแบบ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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