This is a 25-character wide bold rectangle that is subdivided into a
left part (about a quarter) and a right part (about three quarters)
with some additional non-bold stuff in the two parts.

┏┯━┳━━━━━━━┓
┃│☺┃  ╲    ╭╮ ┃
┃╰─┨    ╳  ╰╯ ┃
┗━━┻━━━━━━━┛
0123456789abcdef01234

From looking at the Unicode tables and the above my conclusion is that
using Unicode characters rather than plain ASCII can make figures look
a lot better, but it's not really possible to express significantly
different shapes: like ASCII, Unicode is limited to (mostly) straight
horizontal vertical lines.

This is a PHP file that sends out a "Content-Type: text/plain; charset=utf-8"
header but is otherwise plain text.

Iljitsch van Beijnum