The word 瞬间 is formed through a direct and vivid conceptual combination: the first character 瞬 means "to blink (an eye)", capturing the image of an action that is exceedingly brief, while the second character 间 means "interval" or "space between". When combined, they create a metaphorical unit that literally means "the interval of a blink", visually defining an abstract concept of time as an immeasurably short moment, perfectly illustrating the fleeting nature of an instant.