The Big Prediction Writer​​ by Robert Malissa

This is a system of predicting any word or number using what appear to be everyday materials. In fact, some of those materials are gimmicks hidden in plain sight, and clever ones at that. As you can no doubt deduce from the price point, this is not an electronic solution. It is, instead, a durable method that packs small and delivers a prediction large enough to be seen on a small stage.