vi.grid.illusion: Visual illusions: Scintillating grid illusion and Hermann...

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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

See Also

points, abline

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 documentation built on Oct. 7, 2021, 9:18 a.m.