Actually I came upon this through MO a couple of days ago: in here
(http://aimath.org/aimnews/lmfdb/) there is a mesmerizing image

[![enter image description here][1]][1]

The caption reads

>A Maass form, one of the 20 different types of objects in the LMFDB.

>Image by Fredrik Strömberg

Of course I could just email [the person](https://www.nottingham.ac.uk/mathematics/people/fredrik.stromberg) or [Alina Bucur](http://www.math.ucsd.edu/~alina/gallery/) whose homepage hosts the image, or ask at [LMFDB](http://www.lmfdb.org/) but I somehow prefer to start from here.

Does anyone know which Maass form is depicted here? What does the color coding mean? How has it been calculated? Where can I read about it?

After accepting an answer I found (in the "Related" column), in [an answer](https://mathoverflow.net/a/34515/41291) to https://mathoverflow.net/q/34500/41291 a link to a [more informative page](http://www.mathematik.tu-darmstadt.de/fbereiche/AlgGeoFA/staff/stroemberg/research/gallery/) by Strömberg with lots of different kind of images like

[![enter image description here][2]][2]

or

[![enter image description here][3]][3]

Then I also found another even more haunting and mysterious one at [still different page](http://www.mathematik.tu-darmstadt.de/fbereiche/AlgGeoFA/staff/stroemberg/), again without any details given. Let me reproduce this one too

[![enter image description here][4]][4]


  [1]: https://i.sstatic.net/8BRIg.jpg
  [2]: https://i.sstatic.net/qd7bj.jpg
  [3]: https://i.sstatic.net/Ft2dm.jpg
  [4]: https://i.sstatic.net/CBpS1.jpg