Some elementary symbols used to built impossible structures [Quelques 'symboles' élémentaires utilisés pour la construction de structures paradoxales].
Used codes (pattern order):
P U S R
C L Q
G W D N
E F T
M V X O
B K Y
A H J I
P
U
S
R
C
L
Q
G
W
D
N
E
F
T
M
V
X
O
B
K
Y
A
H
J
I
See the whole set of impossible symbols (alphabetical order):