xeyes
X11 mouse-tracking eyes demo
TLDR
Launch xeyes
$ xeyes
Launch on remote display$ xeyes -display [remote_host]:[0].[0]
SYNOPSIS
xeyes [OPTIONS]
DESCRIPTION
xeyes displays a pair of eyes on the screen that follow the mouse cursor. It's a classic X11 demo application used to verify X11 display connectivity.
The eyes track the mouse pointer position across the entire screen.
PARAMETERS
-display HOST:DISPLAY.SCREEN
X display to connect to-geometry WxH+X+Y
Window size and position-fg COLOR
Foreground color-bg COLOR
Background color-center COLOR
Pupil center color
CAVEATS
X11 only. Limited practical use beyond testing display connections.
HISTORY
xeyes is one of the original X11 demo programs, dating back to the 1980s. It has been included with X Window System distributions as a simple test and novelty application.