too many to think about anymore.
here’s a few I thought of years ago,
a flat panel screen personal monitor for TV, internet and electronic books attached on a swing arm over your bed or lounge chair, wireless to a central server.
the periodic table spice rack, color coordinated for things that go together for different ethnic foods.
all in one Solar Cell, Wind and Thermal modular panels, 1 meter hexagonal. Just plug one in to another as you go.
personal home semi-nuclear/microwave reactor/heat exchanger, for rural locations mainly.
battery powered guitar w/effects, speakers and plug in for mic, for those small acoustic occasions when dragging all that shit around is way overkill.
101 objects that need to be put on a key chain. :rolleyes: