The Jastrow illusion
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An optical illusion where two identical curved shapes look like they are different sizes when placed next to each other.
- Rating
- 5 / 5
- Likes
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- Downloads
- 7
- Makes
- 1
- Views
- 67
- Reviews
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Updated at source:
Model information
- Source
- Printables
- Category
- Other Art & Designs
- License
- Creative Commons — Attribution
How It Works
Two identical curved placards sit close together.
One shape's short inner edge touches the other shape's long outer edge.
The brain compares the touching edges instead of the whole shape.
The short edge makes the neighboring long edge look extra big.
Swapping the positions reverses which shape looks larger.
Printing
I printed with a full infill with 2 different colors
If you have a Colored printer, Make the raised stars (0.2mm higher that top surface) white for added glamour.
I used Rapid PETG for added life, but almost any filament will work.
ONLY 7 MINUTES TO PRINT EACH (In a solid color ).
Age Range
Young enough to appreciate the illusion.
Old enough to be a grandpa.
Skill Level
If you can hold these two placards, your skilled enough to perform the illusion.