I design puzzles from time to time. You can see many of these puzzles at Julie's Puzzle Corner.
Given how much we put ourselves through, I figured it would be fun to just post some of my puzzles here from time to time. So... this is a Bongard problem-- I'm giving you a list, some of which fit the rule and some do not. The trick is to figure out what the rule is. You're welcome to post theories, suggest what may or may not fit the rule, ask whether or not a given item fits the rule, etc., in the thread.
So...
Fits the rule:
Does not fit the rule:
- - 3
- 0
- 45
- 101
- 2,548,743
- 0.11111
Note: there are SPOILERS for this puzzle in the comments section. Read at your own risk.