How to make the Hering illusion (PowerPoint)

This is an easy way to create the Hering illusion with PowerPoint. It takes about two minute.

How to make the Hering illusion (video)
How to make the Hering illusion (PowerPoint)
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How to make the Hering illusion (video)

This is a video of how to make it. If you are watching from a PC, you can change the playback speed by clicking on the “︙” button at the bottom right of the video.

How to make the Hering illusion (PowerPoint)

Select “Shape” > “Line” > “Line” to draw a vertical line (length, color, and thickness as you like).
Select the drawn line and press ⌘ (Ctrl key for Windows) and D to duplicate many shapes. (In the sample image, 18 more lines have been produced. (In the sample image, we have produced 18 more lines, for a total of 19 lines drawn with the original.
Select the duplicated shapes one by one and go to “Format Shape” -> “Size” -> “Rotate” and set the values to 90° or less at equal intervals (in the sample image, I set each value from 90° to 5° in 5° increments).
Select all lines except “0°” (the first line you created) and “90°” and duplicate them by pressing ⌘ (Ctrl key in Windows) and D. Then go to “Align” -> “Rotate” -> “Flip Left/Right”.
Select all the shapes (it’s easier if you press ⌘ (Ctrl key for Windows) and A), then go to “Align” and “Center Left/Right” and “Center Top/Bottom”. (You can add or remove lines as you like. (You can add or remove lines as you like.
Select “Shape” -> “Line” -> “Line” and draw a horizontal line (the length should be longer than “1” and the color and thickness should be different from “1”). (It can be vertical or diagonal.)
Select the “Horizontal line created in 6” and duplicate it by dragging the mouse down while holding down the ⌘ (Ctrl key for Windows), Shift and D keys. (Adjust the height between it and “6” to your liking.
Select the horizontal lines created in “6” and “7” and group them together.
Select all the shapes and go to “Align” and then “Center Top and Bottom” to complete the process.