It just came from using what's already there, and I'm thoroughly convinced that if it's not phones, that there's always going to be enough there that you can build similar solutions that can be very effective in new contexts.
它只是利用现有的材料， 而且我完全相信， 即便不用手机， 也总会有足够的材料 让你可以建立类似的解决方案， 在新的环境中同样会十分有效。