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Pull one item out of a list by its position (0-based; negative counts from the end).

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• List (any): the list to pull an item out of.
• Index (number): which item to pull, 0-based (negative counts from the end). A list of indices pulls one item per index, see below.

• Item (any): the single item at that index, or a list of items when Index is a list.

Wire a single number into Index and you get one item out. Wire a list of numbers in and Item at Index picks one item per index and returns the whole set, in the order the indices came.

That is what makes a per-item pick possible: a Series of seeds through Random gives a list of indices, and that list through Item at Index gives a different item for every position. Feeding a color list in that way is how each item in a collection ends up with its own color.

Geometry items are not the only thing it reads. A plain list of colors, numbers or strings, the kind Collect produces from non-geometry inputs, indexes by position under the same contract: 0-based, negative counting from the end.

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Points inside a group are not items of their own: they travel with the member they belong to. See Lists & collections.

• Collect: build the list to index into | List Length - how many items there are, which bounds the Index.
• Lists & collections | Data nodes