The ornamental design for a self-centering mobile adapted to display photographs vertically and/or horizontally off an arc armature, as shown and described.
FIG. 1 is a perspective view of a self-centering mobile adapted to display photographs vertically and/or horizontally off an arc armature, showing my new design; and,
FIG. 2 is a perspective view of an alternate embodiment of my new design.
Claimed is a design for a self-centering mobile adapted to display photographs vertically and/or horizontally off an arc armature comprising three interchangeable portions: one or more mobile portions, an arc armature portion, and a supporting structure portion.