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ACHIEVE HAPPINESS THROUGH SUNLIGHT etc. Picture your ideal day, just for one second. Are you outside? (Certainly.) Is the sun out? (Of course it is.) Do you have a drink in your hand? Well, that one’s up to you! (Yes.)

I don’t mean to make any assumptions or anything. Maybe your ideal day involves your work desk, total winter darkness, and compulsively checking the same six blogs until lunchtime. But personally, I’m picturing a day spent in the sun with good company, adventuring forth into nature or drinking on a rooftop or lounging by the beach, with the added bonus of self-satisfaction sustainable energy use from all these fancy solar-power gadgets.

SOLAR SPEAKERS First things first: You need a soundtrack. How else will you burst into nostalgic tears, many years later, when your perfect-day song comes on the radio and reminds you of the inexorable passing of time? Call your girlfriend, put on your autumn sweater; say you’re never ever ever getting back together. Solar speakers are an obvious essential for any day spent outside relaxing.