Gear up! What A wild puzzle this one is. Here is the info, right from source:
Gear Up
Oskar van Deventer
The goal of Gear Up is to rotate the discs until the notches in the four tabs are exactly aligned. The puzzle is a stack of four plastic discs attached via a central axle, each has a tab and a notch and can rotate in the axle. The plastic is transparent so that various internal planetary gears can be viewed as the discs are turned. The puzzle operates on the same principle as the differnetial gear in a car. Gear Up was presented to the puzzle community in 2005 by Dave Rossetti. This puzzle is a creation of Oskar van Deventer and was designed during the height of his "gear period". It is a flattened version of the far more expensive Gear Head puzzle.
The version you receive isBLUE. The stock photo, from Oskar is Green. It shows the gears better.
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