Tal said:
Perhaps 'the rational' as we see it, is limited by our abilities of perception.
Rationality is a result of cognition (brain) functions, and is COMPLETELY DEPENDENT UPON and LIMITED by our perceptive (input) capabilities.
At the risk of grossly-oversimplifying, it's like a computer that cannot "crunch" (process) data that isn't entered ino the CPU. If the data resides on a USB thumb drive, and it's not plugged in, good luck processing it!
BTW, here's a pretty cool demo of how what we "hear" is influenced by visual input, based on prior visual experiences. This is an eye-opener for many people, as it shows just how complex and highly-variable our perceptive senses really are, and how what we hear and see is not always what we think it is....