In the text virtual reality is a new concept which takes humans into a computer-modelled environment. Unlike canned computer graphics , virtual reality images are generated on the fly based where you look and go. The computer gets the movement information from devices like head mounted displays , data gloves , and exoscelets you can wear .Michael Antonoff has tested the virtual reality machine in Mall of America in Bloomington. The game was called "Dactyl Nightmare" ,four people could participate and they should wear a HMD for vision and a joy ....