latticework
櫺 centers on a wooden lattice or open framework, typically used in windows or screens to let light and air through while providing structure.
櫺 combines 木 (tree/wood) with 霝, which likely contributes the sound and may relate to openings or light, together suggesting a wooden lattice.
The left side 木 is wood, and the right side 霝 looks like rain 雨 falling through openings 口口口. Picture a wooden window lattice with raindrops passing through its gaps.
For レイ, imagine laying thin wooden strips to form a lattice: lay -> レイ, as you lay each piece into the framework.