Hidden Figures: Finding a Shape Inside a Pattern
What is being tested
You are shown a simple target shape (a triangle, star, arrow, or letter-like form) and a dense pattern of overlapping lines. Usually exactly one location in the pattern contains the target at the same size and orientation; read the instructions in case rotation or scaling is permitted.
Concepts to master
- Distinctive-feature search. Do not hunt for the whole outline. Identify the target's rarest feature (an acute angle, a closed loop, a parallel pair) and search the pattern for that feature first.
- Closure. Hidden shapes are camouflaged by lines that continue past their corners. Deliberately ignore lines that enter and leave the shape; trace only the segments that belong to the target.
- Systematic sweep. Work left to right in bands, or follow the densest cluster of intersections. Random staring produces false positives and wasted time.
- Near-miss traps. Candidates that match two sides but not the third, or that match the shape scaled up slightly, are common.
Worked example
Target: a right triangle with a long horizontal base, a short vertical leg at the right end, and a hypotenuse sloping up and to the left. Search first for a horizontal segment meeting a vertical segment at a clean 90 degree corner with the vertical on the right. That corner appears in the lower-middle of the pattern; from it, follow the diagonal up-left until it meets the horizontal again. All three segments are now accounted for, so the find is confirmed. A nearby candidate has its vertical on the left, which is a mirror image and therefore wrong.
Rule of thumb
Confirm that every vertex and side of the target belongs to the hidden shape before committing. If one side is missing or the wrong length, keep looking.