Trapdoor Card

Pages 13 to 17 were not part of the 1983 edition, but added to an edition published in 1994.
Book
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
Also published here
Variations
 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.