@emc2, I’m so glad you asked. We’re happy to share with you
We didn’t hire any models. The hand is actually that of none other than @zach, our CEO and co-founder. The picture of him holding the Core was inspired by [this picture] (http://cdn.trendhunterstatic.com/thumbs/spark-socket.jpeg), which was taken for Spark’s first Kickstarter campaign, the Spark Socket.
The shot of the Core against the blueprint page was intentional, but without much planning. As we were hand-building our first prototypes, we made it a habit to document the process with a DSLR camera, and this photo was taken in one such a session.
As far as the logo goes, I’m also fairly sure that it was a @zach creation. We’re fortunate to have a CEO with (we think) a great intuition for brand development, graphic layout, and presentation, and have never had to outsource our graphic or user interface design.