One of my favorite things to think about is trying to imagine an alien species with a completely different system of counting and measurement. Would they start

One of my favorite things to think about is trying to imagine an alien species with a completely different system of counting and measurement. Would they start with 2D numbers (like our “complex” numbers)? Would fractions be the default way of counting instead of whole numbers? Or something completely different, like thinking of color shades instead of “words” when thinking of numbers as we do.