```
# NOT RUN {
library(ggplot2)
# You can add plots saved to variables
p1 <- ggplot(mtcars) + geom_point(aes(mpg, disp))
p2 <- ggplot(mtcars) + geom_boxplot(aes(gear, disp, group = gear))
p1 + p2
# Or build it up in one step
ggplot(mtcars) +
geom_point(aes(mpg, disp)) +
ggplot(mtcars) +
geom_boxplot(aes(gear, disp, group = gear))
# }
```

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