a circular black-and-white ring made of alternating dotted and grid-like wedge segments surrounds a large white center on a plain background. - 交流電 幅插畫檔、美工圖案、卡通及圖標
repeating cyan squares and striped circles form a bold geometric pattern across a green background with a magenta gradient, creating a vivid retro decorative surface. - 交流電 幅插畫檔、美工圖案、卡通及圖標
alternating current generator (c.1855) by compagnie l’alliance (paris) published 1877 - 交流電 幅插畫檔、美工圖案、卡通及圖標
black-and-white repeating pattern of striped oval shapes arranged in a tight grid on a white background, creating a bold geometric textile-like surface. - 交流電 幅插畫檔、美工圖案、卡通及圖標
black and white checkerboard pattern with evenly spaced alternating squares across the entire image, creating a high-contrast geometric surface. - 交流電 幅插畫檔、美工圖案、卡通及圖標
