phantasia

phantasia [options]

-display displayname
    Specifies the X server to connect to.

-geometry geometry
    Sets the size and position of the window.

-visual visual
    Specifies the visual to use.

-private
    Use a private color map

The phantasia command is a graphics demonstration program primarily designed to showcase the capabilities of X11 graphics systems. It creates a visually appealing animated scene, often featuring shapes, colors, and motion, which may be of fractal or particle nature. The complexity and appearance of the scene can often be adjusted through command-line options or through interactive elements.
It's often used to benchmark performance of graphics drivers and hardware. Phantasia may have options to control features like the frame rate, the size of the window, or the complexity of the animation. The command is part of X11 utilities.

Primarily, phantasia serves as a demonstration program. It's a useful tool for evaluating the performance of X11 graphics systems and drivers by showcasing a complex animated scene. This can help diagnose performance bottlenecks or compatibility issues. The program serves also as eye candy.

While Phantasia's core behavior is predefined, the provided options allow for a degree of customization. Users can experiment with different visual settings, geometry options, or color modes to adjust the appearance of the demo. This customization can be useful for specific benchmarking scenarios or simply to explore the different visual effects the program is capable of creating.

xeyes(1), xclock(1), xlogo(1)