PERCEPTION & THE SENSES
BY JAMES PENTLAND
WHAT CAN YOU SEE?
OBJECTS IN SPACE PICTORIAL IMAGE
OPTICAL IMAGE
RETINAL IMAGE
VISUAL IMAGE
GRAPHICAL IMAGE
MENTAL IMAGE
VISUAL PERCEPTION MODEL
HOW MANY BLACK DOTS ARE THERE?
THE IMPOSSIBLE TRIANGLE
A
B
C IS THE INNER CIRCLE OF A BIGGER OR SMALLER THAN B & C?
SOLUTION 1: PAGE 37
A
B
IS OBJECT’S A INNER CIRCLE SMALLER OR BIGGER THAN OBJECT’S B INNER CIRCLE?
SOLUTION 2: PAGE 37
B
WHICH WHITE BLOCK IS BIGGER ? BLOCK A OR BLOCK B
A
SOLUTION 3: PAGE 37
A
B
C
D
IS THE LINE FROM A TO B LONGER OR SHORTER THAN THE LINE FROM C TO D ?
SOLUTION 4: PAGE 37
B IS THE DISTANCE BETWEEN A & B GREATER OR SMALLER THAN THE DISTANCE BETWEEN C & D
A SOLUTION 5: PAGE 37
B
OF THESE TWO LINES, WHICH IS LONGER?
A
OBJECT A OR OBJECT B
SOLUTION 6: PAGE 37
IS THE DOT MIDWAY BETWEEN THE POINT AND THE BASE OF THIS TRIANGLE OR IS IT TOO HIGH UP?
SOLUTION 7: PAGE 37
A
B
ARE THE CROSSBARS EXACTLY IN THE MIDDLE OF THE CENTER LINE OF TRIANGLES A & B
SOLUTION 8: PAGE 37
A
C
D IS THE LINE FROM A TO B LONGER OR SHORTER THAN THE LINE FROM C TO D ?
B SOLUTION 9: PAGE 37
A
B
WHICH ANGLE IS BIGGER A OR B ?
SOLUTION 10: PAGE 37
C
B
A WHICH LINE IS LONGER IN THIS PARALLELOGRAM? A TO B OR A TO C
SOLUTION 11: PAGE 37
SOLUTIONS SOLUTION 1 - THE ACTUAL ANSWER TO THIS QUESTION IS THAT A, B & C ARE ALL THE SAME SIZE BUT SINCE OUR EYES PERCIEVE THE SHAPES AROUND THE OUTER CIRCLE TO MAKE IT APPEAR EITHER LARGER OR SMALLER. SOLUTION 2 - OBJECT A INNER CIRCLE IS THE SAME SIZE AS INNER CIRCLE B THIS IS DOWN TO THE FACT IT IS ALSO KNOWN AS THE DELBOEUF ILLUSION. SOLUTION 3 - BOTH BLOCKS ARE EXACTLY THE SAME SIZE. THIS IS BECAUSE THEY LOOK UNEQUAL IN THE SIZE, BECAUSE OF THE DIFFERENT BLACK LENGTHS ON EITHER SIDE OF THEM. SOLUTION 4 - IT APPEARS TO LOOK LONGER, BUT BOTH LINES ARE ACTUALLY THE SAME LENGTH. SOLUTION 5 - THE DISTANCE BETWEEN A & B AND C & D ARE EXACTLY THE SAME, ITS THE WAY THAT OUR EYES DECIEVE US THAT MAKE THIS ILLUSION POSSIBLE. SOLUTION 6 - THE TWO THIN LINES ARE OF EQUAL LENGTH. SOLUTION 7 - IT’S EXACTLY IN THE CENTER. SOLUTION 8 - THE CENTER LINES IN TRIANGLES A & B ARE ALL THE SAME HEIGHT. HOWEVER, THE ONLY DIFFERENCE BETWEEN THEM IS THE LINES LEADING AWAY FROM THEM. SOLUTION 9 - BOTH LINES ARE EXACTLY THE SAME LENGTH. THIS IS DOWN TO THE FACT THAT THE ANGLES OF THE LINES MAKE THEM TO TO LOOK UNEQUAL. SOLUTION 10 - THE ANGLES A & B ARE EXACTLY THE SAME SIZE. SOLUTION 11 - WITHIN THE PARALLELOGRAM BOTH POINTS FROM A TO B & A TO C ARE EXACTLY THE SAME SIZE, THIS IS BECAUSE THE WAY THE LINES ARE POSITIONED AT AN ANGLE MAKE IT SEEM THAT ONE IS LONGER THAN THE OTHER.