animation: vi.grid.illusion – R documentation

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vi.grid.illusion

Visual illusions: Scintillating grid illusion and Hermann grid illusion

Description

The two most common types of grid illusions are Hermann grid illusions and Scintillating grid illusions. This function provides illustrations for both illusions.

Usage

vi.grid.illusion(nrow = 8, ncol = 8, lwd = 8, cex = 3, col = "darkgray", type = c("s", 
    "h"))

Arguments

`nrow`	number of rows for the grid
`ncol`	number of columns for the grid
`lwd`	line width for grid lines
`cex`	magnification for points in Scintillating grid illusions
`col`	color for grid lines
`type`	type of illusions: `'s'` for Scintillating grid illusions and `'h'` for Hermann grid illusions

Details

A grid illusion is any kind of grid that deceives a person's vision.

This is actually a static image; pay attention to the intersections of the grid and there seems to be some moving points (non-existent in fact).

Value

NULL

Author(s)

Yihui Xie

Examples

## default to be Scintillating grid illusions
vi.grid.illusion()

## set wider lines to see Hermann grid illusions
vi.grid.illusion(type = "h", lwd = 22, nrow = 5, ncol = 5, col = "white")

animation

A Gallery of Animations in Statistics and Utilities to Create Animations

v2.6

GPL

Authors

Yihui Xie [aut, cre], Christian Mueller [ctb], Lijia Yu [ctb], Weicheng Zhu [ctb]

Initial release