Following my post regarding the excellent dice bag the LA knitted for me, somebody asked me about one of the dice shown in the photos. After that question, I now present for your edification the art of reading the d4.
Below, we see two d4s; an old-style d4 in pearl, and a new-style d4 in white. Both of them are showing a result of 1.
Below, we see the same two dice. This time, however, they're showing a result of 2.
Below, once again, the same two dice, showing 3.
And finally, the same two dice, both showing a result of 4.
As you can tell, the reading method is consistent: you read the number which is upright. I personally prefer (and have more of) the old-style d4s, but I do have the new ones just in case I have a player who doesn't know how to read a d4 properly.
Of course, if they follow my blog, now they do, and so do you.