When Steven Sasson, the inventor of the digital camera, mentioned that the first digital camera held only 30 photos we immediately thought it was due to limitation of storage capacity. That wasn't the case. In turns out that the 30 photos was an artificial limitation Steven put in place on purpose. He could have stored any number of photos from 1 to 1000 on the digital tape. He chose 30.
After thinking through how people would actually use a digital camera (back in 1970s) he realized that he did not want to store just one or two images on there since this won't be very useful. He also did not want to store 100 or 1000 images on there because nobody knew how to deal with that concept at the time. He chose 30. Here is a great quote which sums up the takeaway from this:
They key is to understand the culture you're dealing with first and foremost. Put just the essential elements of your idea out there so that it does not get confused with things which might complicate the concept.