School slate and four styli or pens from ancient Rome. At the top left is a fragment inscribed with exercises in ancient Greek lettering. From the...教育
dark black coloured scratched rough rustic weathered run down textured empty blank vector backgrounds or wallpaper with uneven texture with copy space - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標
horizontal empty blank rough textured black and white colored divided or halved slate or blackboard vector background with retro grunge uneven paint stroke vertical division into fifty fifty or half - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標黑色
abstract background image of a messy chalkboard with confused yellow, white and blue chalk writings on it - 書寫用石板 個照片及圖片檔黑板, 箭頭符號, 抽象
high angle view of writing slate with crayons by container and socks and hardwood floor - 書寫用石板 個照片及圖片檔
Harry Price, Director of the National Society of Psychical Research showing how 'spirit' writing can be done between two apparently sealed slates.價錢牌
empty blank plain dark gray black textured cracked handmade paper horizontal vector backgrounds like a concrete or plastered cement wall or grainy wallpaper or asphalt rough uneven rustic bumpy road - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標
back to school text and school items on blackboard. digital illustration, chalkboard imitation. - 書寫用石板 個照片及圖片檔黑板, 教育, 數碼製圖
empty blank dark gray black coloured grunge textured horizontal rustic vector vintage graphite, writing slate, blackboard, marble or wooden background with retro style uneven abrasive texture - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標背景 - 主題
empty blank plain dark crisp thick black colored textured chart paper horizontal vector backgrounds like a concrete or plastered cement wall or grainy wallpaper or asphalt road, blackboard, writing slate - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標黑色, 紅毛泥, 背景 - 主題
blank empty textured rough rustic scuffed dark grey black messy dirty blotched mottled horizontal vector background with sand like covering or deposit layer on cemented plastered run down weathered whitewashed stucco wall like blackboard - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標
empty plain blank dark black coloured grunge textured horizontal rustic smudged vector vintage backgrounds with retro style texture uneven peeling off plastered whitewashed wall or blackboard with one big painted blue hexagon shape or benzene ring - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標
bordered segregated divided textured blackboard with hand written scientific formulas and calculations in physics and mathematics covering variety of complex topics, mathematical calculations, formulas, derivations and identities with copy space - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標數學, 數學符號, 黑板
empty plain blank dark black coloured grunge textured horizontal rustic smudged vector vintage backgrounds with retro style texture uneven abstract smudges blotches like peeling off plastered whitewashed wall - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標背景 - 主題
portrait of confident, happy asian/indian rural little boy and girl holding slate board looking at the camera with toothy smile. rural india education concept. - 書寫用石板 個照片及圖片檔印度, 女孩, 教育
grunge texture, black hue, rough, untidy, writing slate with scuff marks; grunge effect; horizontal background, plain, empty - 書寫用石板 個照片及圖片檔黑色, 牆 - 建築物特徵
School pupils, one instructs another using a writing slate, in a classroom at a Government school on Sumatra, in the Sunda Islands, Indonesia, circa...教育
black coloured rough texture grunge vector backgrounds like rustic blackboard with white hand drawn flowchart template with empty blank boxes connected with arrows with copy space - 書寫用石板 幅插畫檔、美工圖案、卡通及圖標
blank green corkboard textured isolated on white background (clipping path!) - 書寫用石板 個照片及圖片檔綠色, 有邊框的, 黑板
