[Nition]

I can only speak for myself but the more I gain knowledge/memory of an object, the more I can fill it in. If I know "bicycle" very well I can visualize all the details - maybe not in full detail all at once but at least by thinking about each part in turn. If my memory of one is not so good, the details will remain not filled in, like a blind spot where my mind fills in the gaps and I don't even notice the missing data until I try to "see" those areas specifically.

The imagined bicycle may be a specific one I recall, or a mixture of various memories of bicycles I've seen.