Astraea
I knew a woman many years ago who read playing cards, and if a reading opened with the Ace of Spades she wouldn't go on - she saw it as the death or dismemberment of the question. The querent could ask the question again later, or in a different way. Traditional horary astrology includes a similar principle in its "considerations against judgement," whereby certain configurations warn the astrologer that the reading will be inaccurate, or that the conditions for answering a question are not yet ripe, or that it is too late to ask.
In a tarot reading, I think that the appearance of a predetermined card might suggest something similar, but the full meaning of the card would hinge on its relationship to surrounding cards and its place in the spread - in other words, that card would contribute to a description of the situation or question, instead of denying validity to the whole reading. And considering tarot as a visual medium, the message would be built into the card, itself: for example, the Wheel of Fortune suggests change and an upset of the present order, within the context of surrounding cards - so it might suggest that not everything in the reading can be fully known or understood in that moment (either by the querent or the reader).
I suspect that much would also depend on the reader's identification with a deeply personal system or set of interpretations, evolved over years of close observation that might not tally with other readers' experiences.
In a tarot reading, I think that the appearance of a predetermined card might suggest something similar, but the full meaning of the card would hinge on its relationship to surrounding cards and its place in the spread - in other words, that card would contribute to a description of the situation or question, instead of denying validity to the whole reading. And considering tarot as a visual medium, the message would be built into the card, itself: for example, the Wheel of Fortune suggests change and an upset of the present order, within the context of surrounding cards - so it might suggest that not everything in the reading can be fully known or understood in that moment (either by the querent or the reader).
I suspect that much would also depend on the reader's identification with a deeply personal system or set of interpretations, evolved over years of close observation that might not tally with other readers' experiences.