Yes, I have needed to identify something I could not see. For example, often times at school events when I was younger there were boxes for the children to reach inside and guess the contents of. In one box was a bowl off peeled grapes, and in another there was pillow stuffing. I had to rely on my sense of touch to make an educated guess as to what was inside, where as these famous scientists used math.
Work Step by Step
The question asks one to describe a time they needed to identify something they could not see so I described reaching into mystery boxes during grade school carnivals.