We also have seen these carved forms used as interior wall ornaments, both in Thailand and in Western environments.
The two long carved pieces are attached to a pivot in the center triangle so they can be folded or spread like wings.
This gaelae is about 20 years old, made of Thai teak and nicely carved.
It is in excellent condition. Dimensions: height 27” (69 cm), width 25” (64 cm), depth 1 ¼” (3 cm).