## Intro [​](/content/docs/getting-started/key-concepts/context/\#intro "Direct link to Intro"/index.html)

Cavalry's architecture does some amazing and unique things. On the surface this means more can be done with less Layers but what's actually going on under the hood?

The underlying concept to understand is that of an **Index**. An index is simply a number passed to another layer. A fundamental part of a Duplicator's role is to assign indices to the Shapes it generates. This index can be used by the Duplicator and other layers to dictate position, rotation, color, number of sides...anything really.

Let's say a Duplicator has been used to create a column of 10 rectangles.

In this case the Duplicator creates 10 indices and uses them to provide each duplicated Shape with a position based on the Distribution settings (in this case a **Grid** with a **Height** of **350** and a **Size Mode** of **Fit**). **Index:0** (the first shape) gets assigned a **Position Y** of **0** and **Index:9** (the tenth/last shape) gets assigned a **Position Y** of **350** with the other Shapes distributed evenly between.

So what happens if this Duplicator is added to a second Duplicator? Here the second Duplicator has been set to a **Grid** of **Count X = 5** and **Count Y = 1**.

The indices flow through to the second Duplicator's shapes. As Duplicators are duplicated, this index count will keep flowing through the graph.

Here's a practical example:

1. Create a [Text Shape](/content/docs/nodes/shapes/text-shape/index.html).
2. Using the `+` button next to the **String** attribute, add a [String Generator](/content/docs/nodes/utilities/string-generator/index.html).
3. Set the **Generator** to **Value**.
4. Add the **Text Shape** to a [Duplicator](/content/docs/nodes/shapes/duplicator/index.html).
5. On the **Grid Distribution** set the **Count** to **X = 1**, **Y = 10**.

**Result**: A column of zeros.

On the surface, there's nothing very interesting going on there 😉 but that's just because we've not asked the Duplicator to do anything with the indices. So let's ask it to create some random values to pass to the **Number** attribute.

1. Create a [Random](/content/docs/nodes/behaviours/random/index.html) Behaviour.
2. [Connect](/content/docs/getting-started/key-concepts/connections/index.html) random.id→stringGenerator.number.

**Result:** Each number is a random number between 0 and 10 (defaults).

The Duplicator passes random numbers to each duplicate.

The above is made possible by the fact that the Duplicator provides an **Index** to each number and the **Random** Behaviour utilises that context.

- **Duplicator** asks **String Generator** 10 times for its **Number**.
- In turn, **String Generator** asks **Random** 10 times for the value of its **Number**.
- During those 10 times, **Random** receives **Index** values of: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
- Based on each index, **Random** alters its **Seed** value to produce different results.

This idea can be applied to any attribute in Cavalry. Let's do the same thing to affect the number of sides of a Polygon.

1. Create a [Polygon](/content/docs/nodes/shapes/basic-shape/index.html) Shape.
2. Add it to a [Duplicator](/content/docs/nodes/shapes/duplicator/index.html).
3. Add a [Random](/content/docs/nodes/behaviours/random/index.html) Behaviour.
4. Set **Minimum** to **3** and **Maximum** to **5**.
5. Connect random.id→polygon.sides.

Each shape is given a random number of sides of between 3 and 5.

This concept can be used on Noise Deformers, Colors, Stroke Widths, Path Lengths, Blur Filters, Asset Arrays, Dynamic Rendering...anything. The possibilities are endless! 😎

### Switching to manual [​](/content/docs/getting-started/key-concepts/context/\#switching-to-manual "Direct link to Switching to manual"/index.html)

Now there are occasions when manual control of how these indices are assigned might be required. There are two levels to this. The first is to prevent the Duplicator from using the 'incoming index'.

Taking our example of a grid of rectangles (the duplicated Duplicator):

1. In the [Attribute Editor](/content/docs/user-interface/menus/window-menu/attribute-editor/index.html), uncheck **Use Index Context** under Duplicator1's **Advanced** tab.

Now the indices from Duplicator1 are being cycled through to the second Duplicator.

To take this idea even further, the help of the [Context Index](/content/docs/nodes/utilities/index-context/index.html) Utility is required.

- [Intro](/content/docs/getting-started/key-concepts/context/#intro/index.html)
  - [Switching to manual](/content/docs/getting-started/key-concepts/context/#switching-to-manual/index.html)