The media where you are trying to represent your model has 2 physical dimensions. You are using the position in your example. The model is understandable until you try to represent a third dimension.
So using position to represent your model works until the second dimension. From there on you need to find a different way of representation.
Color can give you a new dimension to be used as the third one, for example.
Shape could be used for a fourth dimension. And so on.
In this last example the dimensions are represented:
- 1d: position x
- 2d: position y
- 3d: color
- 4d: shape
However, you could use different properties instead of position x and position y.