Editing Jigsaw puzzle (section)

==Puzzle pieces==
[[File:Whimsy.JPG|thumb|A "whimsy" piece in a wooden jigsaw puzzle]]
[[File:3D Jigsaw Puzzle.jpg|thumb|A 3D jigsaw puzzle]]
Most puzzles are square or rectangular, with edge pieces with one straight side, and four corner pieces. However, some puzzles have edge and corner pieces cut like the rest, with no straight sides, making them more challenging to identify them. Some puzzles are round or in a more complex shape, such as profiles of animals, and their edge pieces are therefore curved. Spherical puzzles can have triangular edge pieces.

Otherwise, all or most pieces of a modern jigsaw puzzle interlock by means of rounded tabs (interjambs) and indentations (called "blanks") on adjacent sides. The pieces are normally four-sided and may be uniform in appearance except for the edges and corners. Some puzzles are termed "fully interlocking", which means that a group of assembled pieces fit together tightly enough to be moved without falling apart; sometimes the connection is tight enough that a solved section will remain attached when lifted by one piece. Uniformly shaped fully interlocking puzzles, sometimes called "Japanese Style", are more difficult because pieces are hard to tell apart.{{Citation needed|date=October 2009}}

Wooden puzzles fit together more loosely, with few tabs and blanks, because of the limits of the material and the cutting technology. They sometimes include pieces in recognisable shapes such as objects or animals, known as "whimsies", "silhouettes", or "figurals".<ref>{{cite book |first=Anne Douglas |last=Williams |title=The Jigsaw Puzzle: Piecing Together a History |location=New York |publisher=Berkley |year=2004 |isbn=9780425201824 |page=10}}</ref> Designer Yuu Asaka has created monochrome jigsaw puzzles with five "corner" pieces (with two straight edges)<ref>{{Citation|last=Ramsay|first=Chris|date=2019-03-07|title=Solving The HARDEST JIGSAW PUZZLE!! – LEVEL 10!|publisher=YouTube|url=https://www.youtube.com/watch?v=ks3vbiCSmKI| archive-url=https://ghostarchive.org/varchive/youtube/20211211/ks3vbiCSmKI| archive-date=2021-12-11 | url-status=live}}{{cbignore}}</ref> and consisting entirely of such pieces.<ref>{{Citation|author=Valtiel|date=2019-08-21|title=This puzzle composed only with corners|publisher=[[Reddit]]|url=https://www.reddit.com/r/mildlyinteresting/comments/ctfc61/this_puzzle_composed_only_with_corners/}}</ref><ref>{{Citation|last=Asaka|first=Yuu|year=2019|title=Yuu Asaka interview|publisher=Akita University of art|url=https://www.akibi.ac.jp/interview/23688.html}}</ref> The former was awarded the Jury Honorable Mention at the 2018 Puzzle Design Competition.<ref>{{Citation|year=2018|title=2018 Puzzle Design Competition Results|publisher=International Puzzle Collectors Association|url=https://puzzleworld.org/DesignCompetition/2018/results.htm}}</ref>