### hidden?

This is a built-in turtle or link variable. It holds a boolean (true or false) value indicating whether the turtle or link is currently hidden (i.e., invisible). You can set this variable to make a turtle or link disappear or reappear.

See also hide-turtle, show-turtle, hide-link, show-link

Example:

    set hidden? not hidden?
    ;; if turtle was showing, it hides, and if it was hiding,
    ;; it reappears

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