vi.grid.illusion {animation} | R Documentation |
A grid illusion is any kind of grid that deceives a person's vision. The two most common types of grid illusions are Hermann grid illusions and Scintillating grid illusions. This function provides illustrations for both illusions.
vi.grid.illusion(nrow = 8, ncol = 8, lwd = 8, cex = 3, col = "darkgray", type = c("s", "h"))
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 |
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).
None.
In fact there isn't any animation!
Yihui Xie
http://en.wikipedia.org/wiki/Grid_illusion
http://animation.yihui.name/animation:misc#visual_illusions
# 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")