Trapdoor Card

Pages 13 to 17 were not part of the original edition, date of those pages unknown, certainly after 1987.
1983
Written by Karl Fulves
Work of Robert E. Neale
17 pages (Stapled), published by Selfpublished
Illustrated with drawings by Joseph K. Schmidt
Language: English
15 entries
Cover photograph
Creators Title Comments & References Page Categories
Karl Fulves Introduction
1
Martin Gardner Twist And Link spectator holds end of paper construction which must be entangled in seemingly impossible way
Also published here
  • puzzle in Marin Gardner's "Scientific American" column
 2
Robert E. Neale Submarine Card spectator holds card frame with center torn out, its orientation changes while spectator closes his eyes
Variations 3
Karl Fulves Stepping Thru A Playing Card presentation for Neale's effect
Inspired by 5
Karl Fulves Double Talk presentation for Neale's effect, apparently delaying it
Inspired by 5
Robert E. Neale The Trapdoor spectator holds card with trapdoor with hole cut-out, it is entangled in seemingly impossible way while spectator closes eyes
VariationsAlso published here 6
Robert E. Neale Streamlined Trapdoor simplified design
Inspired by 9
Robert E. Neale Belt Buckle different design
Inspired by 9
Robert E. Neale Double Buckle different design
Inspired by 10
Robert E. Neale Flat Klein paper construction with only one surface
 		11
Karl Fulves Slade's Braid comment on connection with Slade's impossible braiding
Related to
  • "The Church of the Fourth Dimension" (The Unexpected Hanging, Martin Gardner)
 11
Karl Fulves Easy Unlink simple topological unlinking
 		11
Karl Fulves Topological Untrap topological linking and unlinking of one-piece rubber figure, solution to problem on p. 1
 		12
Karl Fulves Step by Step Trapdoor step-by-step instructions of "The Trapdoor"
Inspired by 13
Harry G. Franke Harry Franke's Topological Tricks two square papers with a square hole used for topological fold, another with rectangles with holes
 		15
Data entered by Denis Behr, December 2019.