TEMPE, Ariz. — In the middle of the day, in the middle of the week, in the middle of the Arizona State University campus, it is easy to miss the students sitting with their heads down and their hands together.

They are part of a group of Christian students on the Tempe campus who are praying 24 hours a day for 21 days.

All through the day and night, they pray outside the Danforth Meditation Chapel, their stillness and quiet in marked contrast to the nearly constant rush of the 51,000 students on the campus.

Most students walk by, oblivious of the spiritual event in their midst. But every once in a while, a student will slowly step forward and start praying.

"That's when it's really great. We get caught up in the busyness of our lives," said Chris Ngai, who organized the event. "It's a place where people can speak to God and see the beauty of everything around them."

Many students on campuses nationwide are speaking to God, or, at the very least, hope to.