I'm making a Cellular Automata on a hex grid. Before I actually write the code for the cells I had to write this visualisation to ensure I got the rules correct, The same rule should apply for all cells of the same structure regardless of orientation, so all rotations and flips get the same rule.
After writing this I'm fairly certain I would have screwed up the rules without it. Trying to detect mistakes from the behaviour of the rules would be nearly impossible I think..
Mouse over cells to see the matches.