Brain Test Level 102 Answer
Searching the room, opening drawers and dragging furniture aside to uncover a hidden pair. The socks are not hidden in the room, and no amount of searching inside it will turn them up.
The puzzle
Find the socks.
The answer
Pinch to zoom out on the picture several times. The socks are sitting far off to the left of the visible room.
What most people try first
Searching the room, opening drawers and dragging furniture aside to uncover a hidden pair.
Why that is the answer
The socks are not hidden in the room, and no amount of searching inside it will turn them up. They are outside the frame. Pinch to zoom out several times and the view pulls back far enough to reveal them sitting well to the left of the part of the room you were given. The puzzle is about the edge of the picture rather than its contents.
If your level 102 looks different
Unico Studio shuffles level numbers between game versions and platforms, so the puzzle on your screen may carry a different number from the one here. If the question above is not the one you are looking at, the full levels 101 to 150 walkthrough lists every puzzle in this stretch by its question, which is easier to match than a number.