黑底沙漏 Hourglass on a black background

黑暗中的沙漏，近距离观察，闪烁的灯光照亮它，露出黑色背景上掉落的沙子和透明的玻璃。

Hourglass in the dark seen up close as a flickering light illuminates it revealing falling sand and clear glass, on a black background.