Shells and Sea Glass

Rincon, PR circa 2004. Bought this on the beach. The May Challenge word is Matrix -
a material in which something is enclosed or embedded.

"The tide recedes, but leaves behind bright seashells on the sand.
The sun goes down, but gentle warmth still lingers on the land.
The music stops yet echoes on in sweet, soulful refrains.
For every joy that passes, something beautiful remains" Author Unknown.