Reach out to the glass and it feels cool to the touch. Everything around you looks dark, but there seems to be some light coming from above. As you look up, the enemy spaceships suddenly look much more real. They loom above, blasters at the ready, more coming into the frame as you try and process. A blast comes down at you and you instinctively jerk the ship to the right to get some cover. Welcome to Space Invaders.