Smartphones + Building Blocks would be the future. Jolla is an interesting attempt!
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Keep in mind that the Other Half still must be an attachment to the phone body, and not something that the phone attaches to. I would avoid ideas that would use Jolla as a display for example to a smart beer faucet (unless it is wireless). Whatever is its function, it need to be slim, and simple, something that adds at least one specific function to the smartphone.
Like a game controller, a proximity card reader, a precision light meter for photographers, or a pulse oximeter. I am sure many talents will have great ideas.
We still need to see the connector on the Jolla’s back and learn how to use the port in our software...