# Event Arguments

When you write functions for `given`, `change`, `keep` or `select`, you can name what arguments you want to use. You can choose from these arguments:

* `space`
* `atom`
* `element`
* `origin` (the space that is calling the event)
* `self` (the atom that is calling the event)
* `Self` (the element that is calling the event)
* `selected` (a value that was returned by a `select` function of the same symbol)
* `x` (the relative x-value of the space)
* `y` (the relative y-value of the space)
* `z` (the relative z-value of the space)
* `sites` (an array containing all spaces in the origin's event window)
* `siteNumber` (the site index of this space)
* `time` (the number of event cycles that have happened since page load)

The arguments below are mainly used for internal purposes, but are still available:

* `transformationNumber` (when using a symmetry block, the current transformation number)
* `possibleSiteNumbers` (when using an `any` block, an array containing possible site numbers for this space)
* `possibleXs` (when using an `any` block, an array containing possible relative x-values for this space)
* `possibleYs` (when using an `any` block, an array containing possible relative y-values for this space)
* `possibleZs` (when using an `any` block, an array containing possible relative z-values for this space)
* `transformationNumbers` (when using a `for` block, an array containing transformation numbers)
