Pi deals with the subject of statistics referring to the world with numerical information. Numerous mirrored panels are fixed to the side of walls in the 180 meter long Karlsplatz passageway in downtown Vienna, each furnished with a piece of etched writing. LED displays are mounted under each of these headlines. Based on statistical data previously surveyed according to socio-scientific standards as well as mathematical forecast models and their corresponding algorithms, the numbers visualized there are constantly changing. Located in the central area of the pedestrian passageway an as a symbol for the world, there is the representation of the number Pi. This infinite decimal number is translated into the wide screen format with 478 decimal places, whereby the last currently calculated decimal places are visualized on an LED display with the help of a computer program. Moreover, an exhibition scenario featuring lexical and statistical handbooks dealing with issues such as population development or migration has been created in a free-standing and transparent showcase located right at the turnoff toward the Vienna Secession. In a similar way as in the so-called “factoids” the mathematical problem of attribution is addressed here, which in its political dimensions corresponds to the global phenomenon of migration as presence, affiliation and exclusion.