How many prongs do あなた see?
I see two on the bottom—but on the top, three
Solution: Cover the 上, ページのトップへ of the trident and あなた see two prongs. Cover the bottom and the trident now has three prongs. あなた can draw this object, but あなた can’t construct it. (impossible-object illusion)
THE ROYAL MESSENGER ARRIVING WITH A LETTER FOR THE KING
The red tape on the letter is longer than the blue. But is this really true? Remember, now あなた are in OPT!
Solution: Angles are sometimes tricky! The red and blue tapes on the envelope are the same length. If あなた remove the outline of the envelope, あなた can see this. (geometrical-contrast illusion)
THE PRINCESS PICKING A SPECIAL BOUQUET
お花 fair, お花 bright.
Which 花 center is larger—the black または the white?
Solution: The black and white centers are the same size. The white center appears smaller because larger circles surround it. The black center appears larger because smaller circles surround it. (geometrical-contrast illusion)
THE OPT SIGN POINTING THE WAY TO THE ZOO
によって the sign the royal family will stop. Which line is longer, the bottom または top?
Solution: Both lines are the same length. When the arrows point outward, the line appears shorter. When the arrows point inward, the line appears longer. (geometrical-contrast illusion)
THE BIRTHDAY PARTY FOR THE PRINCE
This gift, unwrapped, tells the Prince’s age.
This is what the dragon said,
“Six blocks become seven if あなた stand on your head. HAPPY BIRTHDAY!”
Solution: You don’t have to stand on your head! If あなた turn the book around, あなた should see seven blocks with white tops. The number of blocks あなた see depends on whether あなた view the boxes as having a white 上, ページのトップへ または a white bottom. (reversible-image illusion)
