package icon


A kaleidoscope based on complex polynomials. Trippy.
Did you ever wonder what the world looks like through a
holomorphic function?

No? Wondering what a 'holomorphic function' is in the first place?

Don't worry! You don't need to know any of this to use the app.
Just touch the screen and see the math at work!

The Poleidoscope shows a rectangular domain of the plane of complex numbers.
The user sets up roots and poles of a rational function on the screen
and this function is then used to deflect the live camera picture.

Holomorphic functions are examples of so-called 'conformal mappings' which
are prominently featured in the works of contemporary artists such
as M.C. Escher. The Poleidoscope provides a live experience of similar

For those more involved in mathematics the app is a way to visualize
complex polynomials and rational functions and give a feeling for
several topics in complex analysis such as differentials of holomorphic
functions, Rouche's theorem, ramifications, local normal forms, etc.


Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 0.1.0 (1) suggested Added on 2021-06-07

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.

    Download APK 2.8 MiB PGP Signature | Build Log