Inky-Phat Display: How to make blank or clear display

How do you clear or blank out the Inky-Phat display?
I would like to show a display, then blank it out, then display again.

I’ll add a clear method for this in future, but for the time being you can paste an empty image or draw a blank rectangle, like so:

inkyphat.paste('P', (inkyphat.WIDTH, inkyphat.HEIGHT)))