What is the connection between a lava lamp and random number generation?
Assessing what is random and what is not is not easy; after all a dice and a flipping coin are only ruled by basic rules of mechanics. We say that it is random only because it is hard to predict. When you ask your computer for a random number, there is nothing really random in it either, since a computer can only run predefined methods.
The video below explains how even a computer is not good enough at giving random numbers and because of that they are using pictures of Lava Lamps to generate a stream of random numbers.