To put it simply, it is the situation where we see a list of items forming a scenario, and then the ability to ask the question: What should also be here but is missing ?
Similar to noticing the difference between different things, seeing what is present needs nothing but a reasonable (not necessarily normal) visual acuity, but it calls for active brain function to remember to ask the very question of what is not there.
For example, in a neurology short case, when we see a patient with paraplegia and hyper-reflexia and bilateral up-going plantar response and a sensory level, we ask: Why does the patient have no urinary catheter?
Or, in the recent incident of government officials trying to promotion the bidding for the 2023 Asian Games, we find Mr. Fok and several Mr. Tsang going everywhere to solicit support, and we ask: Where is Henry the Chief Secretary?
And one often learns a lot by spotting what should be there is not there.
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