the.com/sleight of hand

The art of lying to your eyes while your hands tell the truth, badly.

means Skillful hand movements used by a magician or trickster to perform tricks or deceive onlookers without them noticing.

from From Middle English 'sleighth' or 'sleght,' meaning cunning or cleverness, itself borrowed from Old Norse 'slægð' — related to 'sly.' The 'hand' was bolted on later to specify exactly which body part was doing the cunning. So the phrase literally means 'cleverness of hand' — your fingers, officially certified sly.

not slight
spelled sleight, meaning cunning skill, not smallness
real secret
misdirection beats speed; attention is the actual target
origin
from old norse slaegth, meaning cleverness or trickery
magician's rule
the hand reveals nothing the mind hasn't already allowed
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