หลอดไฟฟ้า, สมอง, บันได, หัว, ชาย, ความคิด, ภาพเงา, บันไดวน, ขั้นตอน, ลุกขึ้น
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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