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"You practice color theory on small scale hobby miniatures."
I say this a lot. When they ask what kinds, I know I've got them on the old proverbial baited hook and show them pictures of my older completed projects. While at the same time I mention there is a super fun game I'm able to play with these cool models. I also tell those same people that this is a hobby shared by millions of people world wide who travel to compete with how well they have painted or how well they play.
The main thing to remember is to be passionate about what you are talking about. If you are enthusiastic, the person who asked will feel that. But when explaining it, don't go into specifics. Keep it fun and easy to grasp.