Answer: It’s not really very easy, as most of their designs are inspired from all around everywhere, so that it’s really but really difficult to know which may correspond to the exact representation of a mood with such a lot of inspiration. But, wherever they come from, they do always have the same logo. Can’t be sure of counterfeits, though!
No, don’t ever think they steal designs … They are making use of a specific law, that allows the reproduction of whatever, designs, machines, etc. after a certain number of years.