I wanted to do something ambient this week, and it ended up a bit more dense than I planned, but there three convolution reverbs (two of which, cascading, give that breathing effect), a lot of synthetic percussion, some drum machines, Kastle modular synth, and slowed-down singing bowl (as well as slowed-down in-my-tracking-space ambience). Title from the bell-like tonality of the singing bowl, and the fact that 15 is the fifth Bell number.