สมอง, หลอดไฟฟ้า, คน, สัญลักษณ์, ความคิดสร้างสรรค์, แนวคิด, ใจ, ความคิด, ทางใจ, จิตวิทยา, กลุ้มใจ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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