This open-source app displays 50,000 particles attracted to up to 5 points that you can move with your fingers.
Inspired from the following project: <a href="https://www.google.com/url?q=https://www.google.com/url?q%3Dhttps://code.google.com/p/renderscript-examples/wiki/Gravity%26sa%3DD%26usg%3DAFQjCNEPpKc6dg_wzEiq4rcWIv5kzavF8g&sa=D&usg=AFQjCNEwgqwpJsy4QhqCeJ-yw3TLsUrNHQ" target="_blank">https://code.google.com/p/renderscript-examples/wiki/Gravity</a>