Zentai, it is a tight full body suit that cover wearers from head to toe all over up, and of course in cluding the eyes. when wearers in zentai, they will be especially outstanding and cool, due to the fully covered reason, they could be all green, yellow, red and even a rainbow.
For this reason, many people use zentai as their way to draw others attention, especially to those street artists. wjhen they are in zentai, they could easily be attractive to all the passengers, so they don't have to worry that people won't be interested in them.
And these green lycra zentai wearers, they are just like a fresh air that make people can not ignore them. although they are just lying down on the floor, together, but for us, they are doing some kind of art thing. maybe they are promot that we should do kindly to our environment. this is my understanding to them.