With just a few more details added, the box has become a sock drawer
—with one sock missing, naturally.
This section could also be called When Good Vanishing Points Go
Bad. Artists sometimes need to place the vanishing points so far apart
that they are, in fact, off the page, where we can’t see them. Yet, this
placement may be correct. Still, some artists feel awkward about this,
and therefore, mistakenly try to stuff both vanishing lines onto a
single page. Failure to separate the vanishing points a comfortable
distance apart will cause your image to suffer from distortion.