IPF what?

Inverse pole figures (IPFs) work somewhat like maps. Imagine you have a point on the globe. How could you show its position on a flat map? One way would be to draw a line from that point to the south pole on the globe and use the point where that line intersects the horizontal plane. For a beer, its three characteristics - color, alcohol content and taste can be used to represent a point on the "Beer globe". Then project that point on a 2D map to get a beer IPF or brewPF*.

*I am taking artistic liberty here. Actually you need only two quantities to locate a point on a unit sphere (think lattitude and longitude). To represent three quantities, I additionally use the marker size. A projection of the positive octant in 2D would give a quarter-circular IPF. I am forcing the projection to occupy the pizza-slice shape, which looks lot cooler than a quarter-circle.