Cleaning up my room

I did some cleaning for my room and came across this pile of cardboard. Just for your information, they are the cardboard at the end of the page of foolscape pad.

I know it's kinda lame to collect such things, but i dunno.......just got this habit. haha. This collection started when i was in secondary school all the way to end of my JC life. That's why the stack of cardboard is so thick. But i have decided to recycle it, haha, save space too.