These are three normal gears
Normally, three gears connected to each other will rotate like the ones above. The first and last gears will rotate in the same direction, while the middle gear will rotate in the opposite direction.
However, it is possible to create three connected gears that are deceptive. Why? They all rotate in the same direction.
Paradoxical Gear Set
And what's going on with this cube gear?
Gear animation is from Robives>>