The rain fell for 40 days and 40 nights. But on day 41, the storm stopped, and the flood resided.
Goliath taunted the Isrealites for 40 days, and on day 41, David killed him.
After 40 days and 40 nights of fasting and temptation in the desert, Jesus began His public ministry on day 41.
In scripture, we see time and time again the number 41 represent the moment after the struggle, and the beginning of a new chapter. Project 41 exists to remind people that the storm does not last forever.