drops of rain, to fall in drops
霝 centers on falling drops of rain, with a focus on the individual droplets rather than a continuous downpour.
霝 is a rare character combining 雨 (rain) with three 口 (mouths or openings), likely representing raindrops falling into openings or containers. The exact historical development is uncertain.
Rain 雨 falls as distinct drops into three open mouths 口, each catching a drop. This is the image of raindrops falling.
For レイ, picture a ray of light catching each raindrop as it falls: ray -> レイ, and each drop sparkles.