The Japanese term keitai was imported to trollish to describe a tool user culture encompassing formerly separate mobile phone, mobile game, console game, MP3 player, PDA and even remote control devices for home theatre. In Japan, even some toilets. According to ubiquitous computing theory these devices are tending to fuse into a single all-purpose digital device worn on the body interfacing eyes and ears of many people. (What Craig Hubley called a very personal computer]" in a paper predicting it in 1990). In his words:
"Personal normative media are obviously enabled by such devices: moods, diets, time management and direction to entertainment and social events of interest. Mobile gaming, for instance, has grown from zero to two hundred million terminals over 2004-6. Cameras are now in most mobile phones, and many are now also MP3 players with stereo sound. These devices will eventually let us share what we currently see and hear, just saw or heard, and what we want to see and hear. But more important they will let us influence and persuade each other to move, buy and even vote in ways we agree on. The very personal computer we carry on our body is also a very social interface, one that provides potentially unlimited information on ourselves to our peers, and lets us pursue missions in common." This is the essence of keitai culture.