Ames window
Trapezoid that appears as rectangular
The Ames trapezoid or Ames window is an image on, for example, a flat piece of cardboard that seems to be a rectangular window but is, in fact, a trapezoid. Both sides of the piece of cardboard have the same image.
Nº Q4745894 ★
Common · Knowledge
Ames window
Trapezoid that appears as rectangular
The Ames trapezoid or Ames window is an image on, for example, a flat piece of cardboard that seems to be a rectangular window but is, in fact, a trapezoid. Both sides of the piece of cardboard have the same image.
Last price
—
Floor price
—
7-day median
—
30-day sales
0
30-day range
—
In circulation
0
Price history
median
low – high
sales
No sales in this period
Show table
| Date | median | Low | High | sales |
|---|
Sales history
- Last sale
- —
- 30-day average
- —
- 30-day low
- —
- 30-day high
- —
- Sales 7d
- 0
- Sales 30d
- 0
No sales yet.
Anonymous sales: no buyer or seller shown. Figures count player-to-player sales only.
From Wikipedia
The Ames trapezoid or Ames window is an image on, for example, a flat piece of cardboard that seems to be a rectangular window but is, in fact, a trapezoid. Both sides of the piece of cardboard have the same image. The cardboard is hung vertically from a wire so it can rotate around continuously, or is attached to a vertical mechanically rotating axis for continuous rotation. When the rotation of the window is observed, the window appears to rotate through less than 180 degrees, though the exact amount of travel that is perceived varies with the dimensions of the trapezoid. It seems that the rotation stops momentarily and reverses its direction. It is therefore not perceived to be rotating continuously in one section but instead is misperceived to be oscillating. This phenomenon was discovered by Adelbert Ames, Jr. in 1947.
Text: Wikipédia, CC BY-SA 4.0. · Image: VanBuren (CC BY-SA 3.0) ·
Related cards
Windowsill
Horizontal structure immediately under a window
Nº Q1391592 ★★
Trapezoidal rule
Numerical integration method
Nº Q833293 ★★
Window function
Function used in signal processing
Nº Q1404885 ★★
Vista paradox
Optical illusion in which an object seen through an aperture appears to shrink in apparent size as the observer approaches the aperture
Nº Q73649929 ★
Jalousie window
Window composed of parallel glass, acrylic, or wooden louvres set in a frame
Nº Q2449889 ★★
Cathode ray tube
Vacuum tube that can show moving pictures, vector graphics, or lines
Nº Q83913 ★★★