Right now I'm reading
Thinking Fast and Slow which is describing the natures of heuristic (fast) and analytic (slow) thinking.
Example of fast thinking (paraphrased):
Steve is a quiet man, keeps to himself and is very well organized. Is Steve a librarian or a farmer? Example of a slow thinking
17 x 24 Heuristic thinking will more times than not arrive at the conclusion Steve is a librarian. Yet farmers are typically quiet men who keep to themselves and are well organized. Fast thinking does not take into account that there are actually more men farmers than men librarians.
Unless you are a whiz at math, it will take you quite a bit more time to come to the conclusion of what 17 x 24 is.
Conclusion: Bapu is a heuristic poster.