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This allows everyone to know if they can put their dishes in the washer, as opposed to just leaving them on the counter because "I didn't know if it was clean, and.."
I made six of these and gave them as Christmas presents. The process involved cutting six thin sheets of dark and light woods (3 each) for each word, and then just swapping out the contents of the words. The lines across the middle are from the original idea, which was to have each side be half and half up and down, if that makes sense. But it didn't look good to me, so I went this way.
I learned a lot about doing this kind of thing as I went through the various steps to completion. One of the most important things being "make a prototype!"