Every primitive logical human (infant) knew very well that we cannot take away one from nothing.But we beat it into them and they gave in and accepted the number minus-one. Then every adult knew very well that there was no such number as the square-root of minus-one, but they gave in and just went along with the absurdity of it all. Well, the primitives or infants were right all along, there is no such number as minus-one, meaning the impossible "take away one from nothing". What really does exist however is the number-one times a rotation of two quadrants of polarity-rotation into inverse-one and the square-root of that is so obvious that even our colleagues in the neo-Pythagorean School of "flat-plane-arithmetic" might eventually be able to grasp it.
Click on the above sketch to proceed with the tutorial.