The wheel was discovered around 5000 years ago.
During the age of wagons & chariots, it may have never occurred to anyone that putting two wheels in line with each other would be a practical thing.
But finally in 1817 the bicycle was invented, and that idea led to the motorcycle, and doing backflips:
At the approach of danger there are always two voices that speak with equal power in the human soul:
one very reasonably tells a man to consider the nature of the danger and the means of escaping it;
the other, still more reasonably, says that it is too depressing and painful to think of the danger since it is not in man’s power to foresee everything and avert the general course of events.
Therefore, better to disregard what is painful till it comes.
Leo Tolstoy, War and Peace