1. shadow box - Noun
2. shadow box - Verb
a shallow rectangular box with a transparent front used to protect and display small items (jewelry, coins, etc.)
Source: WordNetshadow-box
If you've amassed a quirky group of mini collectibles that are just taking up space and catching dust, relocate them into this 8-by-10-inch walnut-finished shadow box frame. Source: Internet
In Headlights on the Prairie, Rebein has created a literary shadow box of sorts, a book in which moments of singular grace and grit encapsulate a life and a world. Source: Internet