Simplex

Two things.

First, I like the outrageously simple design that lacks the mechanical perfection in today's world. I like the stark black and white.

Second, I like the word. It is from that time before it was used in communications. I like it for the obvious simple/complex conjunction.

And for those who want to kow, it is a box lid. Yes, box lid. Not a chastity type box lid but a journal box lid. Now you may ask "Who would put their journal in a special box with such a nice lid?"