If I recall correctly, it's the center (the center of the piece, where all the perspective reverts back to)
The artist who traveled to the Louvre in hopes of painting one gallery containing several masterpieces, only to find the gallery filled with contemporary works was Samuel E.B. Morse. <span>After having established his reputation as a portrait painter, in his middle age Morse contributed to the </span>invention<span> of a single-wire </span>telegraph<span> system based on European telegraphs. He was a co-developer of the </span>Morse code<span>, and helped to develop the commercial use of telegraphy.</span> I hope that this is the answer that you were looking for and it has helped you.