Tim Holtz Idea-ology - Bird Cage

These charming dimensional birdcages have a detachable back perfect to enclose artwork or other tiny trinkets you want to capture inside. It’s flat back allows you to secure it to a canvas or book cover, hang in your next assemblage, or create a whimsical piece of jewelry. Whatever ideas you may have, let your creativity take flight.
As the man himself puts it: "these cool birdcages are so fun and versatile to use.  The removable back allows you to add your own artwork or photograph inside the cage as well as adding any dimensional trinkets that will fit.  These cages are perfect to use in the configurations boxes or since they are flat backs they can also be used to embellish a canvas or perhaps a book cover"

the Birdcage stands approximately 40mm tall and is 15mm deep at the widest point.  See the additional image below for more detail.