Can you save a pdf/jpg/png as an object and arrange in a single plot?

I know how to save a plot as a pdf to disk …

pdf(file = "sample.pdf")
plot(x=1:2,y=1:2)
dev.off()

But, instead of sample.pdf could I make the pdf an object in the global environment? I want to arbitrarily resize some plots and combine them in a grid. I can do it by saving the plots to disk and applying Imagemagick … but how can I skip the export and reimport steps?

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