One of the first things learnt in organic chemistry is that wedged bonds can be thought of as bonds coming out of the plane of the paper towards you, and hashed bonds can be thought of as bonds going behind the plane of the paper away from you.
What is rarely discussed, is the difference between actual 'wedged' bonds, and the 'block' variety. The diagram below from Organic Chemistry Strategy and Control by Stuart Warren goes some way to explaining that in theory at least, the two sets of bonds exist to allow us to describe absolute or relative stereochemistry.
(In practice, this is rarely followed, and individual groups/labs tend to, rightly or wrongly, favour one type over another for stylistic reasons).
What has always baffled me, however, is the direction in which the wedged bonds originate/point towards.
In most modern usage, the small end of the wedge/hash is at the chiral centre, and gets larger towards the substituent, however some (mainly older chemists, whom I'm going to give the benefit of the doubt and assume aren't just bad at using ChemDraw) chemists have the hashes differently to the wedges, as per the molecule below.
Is this something that is advisable (presumably it's meant to show some kind of 3D perspective)/are there any actual IUPAC rules/guidelines on this other than following what looks good/is conventional?