Modular phone cases with nested compartments filled with curated micro-kits. Pop open a layer, discover a new hobby.
You're waiting for coffee and pop open your phone case's third layer to discover a tiny watercolor kit someone gifted you. You squeeze the pigments, paint a mini masterpiece on the included postage-stamp canvas, and a stranger nearby notices, smiles, and "tumbleweeds" you their own micro-gift — a packet of origami paper that rolls perfectly into your now-empty compartment.