Today I have received the Double Think Binary Ring puzzle.
Despite the initial stiffness the movement is brilliant. And as long as
we ensure that all parts are properly aligned, turning the big circles
becomes easier. Regarding the small circles (the 180 degree ones)
those are very easy to move as there are less pieces.
The color configuration makes it very attractive, and its shape
(as I had already said) is very Tron-like (did I say I love 80s video games?).
Now I am wondering who are the other three lucky recipients.