This is an authentic CMY Block.
CMY stands for Cyan, Magenta and Yellow, (also known as RYB for Red Yellow Blue) are the three subtractive primary colours in life.
The Cube has 6 faces and 12 edges.
You can rotate the cube or change the angle from which you're looking at the it and you'll see different colours coming to life. And depending of your environment you're in, you will discover endless different and new colours and shades. This is called subtractive colours mixing.
The Small CMY Block is 30*30*30mm
The Medium CMY Block is 50*50*50mm
The Large CMY Block is 70*70*70mm