Planes are like facets in ggplot2. You use plane_wrap and specify the planes, unname using the planes function.

iris %>%
  g2(asp(Petal.Length, Petal.Width, color = Species)) %>% 
  fig_point() %>%
  plane_wrap(planes(Species))

There are different types of planes, the default is list.

g2(temp, asp(city, temp, color = city)) %>% 
  fig_interval() %>%
  plane_wrap(planes(month), type = "circle")
g2(temp, asp(month, temp, color = city)) %>% 
  fig_interval() %>%
  plane_wrap(planes(city), type = "mirror")
iris %>%
  g2(asp(Petal.Length, Petal.Width, color = Species)) %>% 
  fig_point() %>%
  plane_wrap(planes(Species), type = "tree")