Sun Dial: Exploring Techno-Spiritual Design through a Mobile Islamic Call to Prayer Application is a paper from back in 2008 about possible concepts to serve Muslims’ prayer practices through interesting technology.
The team in Atlanta worked with the local Muslim community to tap into their current & historical rituals, and then figure out new, modern ways to serve them.
Here are some of the concept designs that she proposed — the paper above explains her process & prototypes in greater detail.