I am thinking about adding something in the 2 bottom corners, so those are left unfinished for now!
Update; I experimented with a raised area in each corner but decided I didn’t like how it looked afer all, so the corners are just mitered.
A bit of historical trivia, from the July, 12th, 1898 NY Times;
The new seal of the Board of Education was used for the first time yesterday.The design is an open book, resting against the torch of wisdom, and surrounded by a wreath of ivy. Around the wreath are the words: Board of Education, City of New York.”