# Celick The package `org.cell2d.celick` and its subpackages consist of classes directly copied, with or without modifications, from Slick2D, the library on which Cell2D is based. They are sometimes buggy, often poorly documented, and thus largely hidden away. Cell2D's online Javadoc excludes them, and the most you'll ever *need* to interact with them is passing instances of the Graphics class around as method parameters. You might have some use for them, though, in particular Graphics' functionality of drawing basic shapes on the screen. If you do, the javadoc in the Cell2D download includes them, and you can find that same javadoc online [here](https://www.cell2d.org/celick-javadoc/) - but tread with caution. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://cell2d.gitbook.io/cell2d-documentation/general/celick.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.