I am lefthanded for writing but anything that requires any strength (tennis, throwing things, hitting people) I have to do with my right hand
don't play guitar or violin but would actually have a lot of difficulty playing them the right way round (have tried, hopeless). And when I first started teaching myself recorder way back when, did that the wrong way round too - was mortified to discover this when I started lessons (but swapped without too much trouble)
as to why dunno but lots of studies get done on it.
heres something:
"There are many theories on how being left-handed affects the way a person thinks. One theory divides left- and right-handed thinkers into two camps: visual simultaneous vs. linear sequential.[26][27][28][29]
According to this theory, right-handed people are thought to process information using a "linear sequential" method in which one thread must complete its processing before the next thread can be started.
Left-handed persons are thought to process information using a "visual simultaneous" method in which several threads can be processed simultaneously. Another way to view this is such: Suppose there were a thousand pieces of popcorn and one of them was colored pink. The right-handed person ? using the linear sequential processing style ? would look at the popcorn one at a time until they encountered the pink one. The left-handed person would spread out the pieces of popcorn and visually look at all of them to find the one that was pink. A side effect of these differing styles of processing is that right handed persons need to complete one task before they can start the next. Left-handed people, by contrast, are capable and comfortable switching between tasks. Left-handed people may have an excellent ability to multi-task. Perhaps the anecdotal evidence that suggests they are more creative stems from this ability to multi-task.
Right-handed people process information using "analysis", which is the method of solving a problem by breaking it down to its pieces and analyzing the pieces one at a time. By contrast, left-handed people process information using "synthesis", which is the method of solving a problem by looking at the whole and trying to use pattern-matching to solve the problem. [3] Ultimately, being left-handed is not an all-or-nothing situation. The processing styles operate on a continuum where some people are more visual-simultaneous and others are more linear-sequential. This can be further explained in the use of computers. A computer processor can only process one piece of information at a time, regardless of how many tasks you may be running. But a computer with (for example) four processors; each processor still only processing one piece of information each but four pieces at once making the processing of information faster. In this sense, a right handed person can only process one piece of information at a time would in theory think more slowly than a left-hander who can process (for example) four pieces of information at a time. Also, it is very difficult to ascertain the way a human being behaves within the black box that is the brain. Whether this theory about processing styles is valid or not will be borne out by future experimentation."
could be bollards of course