five centimeters per second.... or a chain of short memories about their distance...

Akari Shinohara: Hey... They say its five centimeters per second.
Takaki Toono: What do you mean?
Akari Shinohara: The speed at which the sakura blossom petals fall...
Five centimeters per second...

"The things I had to tell her...
The things I hoped she would listen to...
There were so many of them..."

"At what speed must I live... to be able to see you again...?"

-from 5 Centimeters Per Second (秒速５センチメートル, Byōsoku Go Senchimētoru) by Shinkai Makoto (新海 誠)