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This one's more subtle; it kind of turns the original idea inside out. It took me a really long time to figure out satisfactory formulas for 1 and 2 in this one.
I'd like to say I'm done making these, but I don't think I'll be able to stop myself if I get another idea that intrigues me.
Once again, relying with gratitude on Timothy Valentine's original www.flickr.com/photos/el_ramon/40405629643 as source material.
In case you are not familiar with all of the symbols in some of these formulas: en.wikipedia.org/wiki/Floor_and_ceiling_functions