What are the most unusual shapes for pieces in a wooden jigsaw puzzle?

Wooden jigsaw puzzles often feature a variety of unique and unusual shapes to make the puzzle more interesting and challenging. Some of the most unusual shapes for pieces in a wooden jigsaw puzzle include:

Whimsy Pieces: These are pieces shaped like recognizable objects or characters, such as animals, people, vehicles, or everyday items. They add a fun and surprising element to the puzzle.
Irregular Geometric Shapes: Unlike the standard interlocking pieces, these pieces may have asymmetrical or highly irregular edges that do not follow a predictable pattern.
Borderless Pieces: Some puzzles include pieces that form the edge of the puzzle without having straight edges themselves, creating a more complex boundary.
Double-sided Pieces: Pieces that are printed on both sides, with different parts of the image on each side, add an extra layer of difficulty and uniqueness.
Interlocking Rings or Spirals: Some puzzles feature pieces that interlock in circular patterns or spirals, deviating from the traditional grid layout.
Three-dimensional Pieces: These are pieces that may have varying thicknesses or layers, creating a 3D effect within the puzzle.
Rebus Pieces: Pieces that together form a word or a phrase, often requiring the solver to piece together the image to read the hidden message.
Non-interlocking Pieces: Pieces that do not fit together in the traditional interlocking manner but instead rely on the overall image and positioning to stay together.
Puzzle-within-a-puzzle: Some puzzles include mini puzzles within the larger puzzle, where a subset of pieces forms a smaller, standalone image or shape.
Shaped Puzzles: Puzzles that themselves are shaped like an object, animal, or character, rather than being a traditional rectangular or square shape.

These unique shapes not only add to the aesthetic appeal of the puzzle but also significantly increase the difficulty and enjoyment of the puzzle-solving experience.