

Always Empty Puzzle Box (Phil Tomlinson) by Puzzleparadox, on Flickr

Windmill Burr (Brian Young) by Puzzleparadox, on Flickr

Biohazard / Elemental:Neon (Dave Litwin) by Puzzleparadox, on Flickr

Labyschloss (Jean Claude Constantin) by Puzzleparadox, on Flickr

Mephisto (Seven Stone) by Puzzleparadox, on Flickr

Rotarius (Seven Stone) by Puzzleparadox, on Flickr

Convolution (Stewart Coffin) by Puzzleparadox, on Flickr