THE schloss GUARD WITH HIS TRIDENT
How many prongs do Du see?
I see two on the bottom—but on the top, three
Solution: Cover the oben, nach oben of the trident and Du see two prongs. Cover the bottom and the trident now has three prongs. Du can draw this object, but Du 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 Du are in OPT!
Solution: Angles are sometimes tricky! The red and blue tapes on the envelope are the same length. If Du remove the outline of the envelope, Du can see this. (geometrical-contrast illusion)
THE PRINCESS PICKING A SPECIAL BOUQUET
Blumen fair, Blumen bright.
Which blume center is larger—the black oder 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
Von the sign the royal family will stop. Which line is longer, the bottom oder 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 Du stand on your head. HAPPY BIRTHDAY!”
Solution: You don’t have to stand on your head! If Du turn the book around, Du should see seven blocks with white tops. The number of blocks Du see depends on whether Du view the boxes as having a white oben, nach oben oder a white bottom. (reversible-image illusion)
How many prongs do Du see?
I see two on the bottom—but on the top, three
Solution: Cover the oben, nach oben of the trident and Du see two prongs. Cover the bottom and the trident now has three prongs. Du can draw this object, but Du 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 Du are in OPT!
Solution: Angles are sometimes tricky! The red and blue tapes on the envelope are the same length. If Du remove the outline of the envelope, Du can see this. (geometrical-contrast illusion)
THE PRINCESS PICKING A SPECIAL BOUQUET
Blumen fair, Blumen bright.
Which blume center is larger—the black oder 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
Von the sign the royal family will stop. Which line is longer, the bottom oder 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 Du stand on your head. HAPPY BIRTHDAY!”
Solution: You don’t have to stand on your head! If Du turn the book around, Du should see seven blocks with white tops. The number of blocks Du see depends on whether Du view the boxes as having a white oben, nach oben oder a white bottom. (reversible-image illusion)