> The observation of the aforementioned seemingly random times 𝜏 might lead one to hypothesise there to be a chaotic effect in the flight of a beer mat. Howeve

> The observation of the aforementioned seemingly random times 𝜏 might lead one to hypothesise there to be a chaotic effect in the flight of a beer mat. However, it will turn out that this effect comes from the inability of humans to throw the disk reproducibly. > In principle, the theory of a rotating thin disk moving in air is known. Unfortunately, solving the corresponding equations including effects from turbulence is analytically intractable and even numerically highly demanding. Isn't this exactly what a "chaotic effect" is? The influence that small changes in initial conditions has on the final outcome, and the analytical difficulty in correlating the two?