Memorizing IPA consonants is trivially easy; each symbol represents one sound, and that sound can be described with a variety of parameters about manner of articulation, etc.
The IPA vowels, however, are a whole other beast. How can they be memorized if describing them is not so easy? Of course, some symbols are just English vowels, which makes them pretty self-explanatory, but other ones like the back medium vowels are a bit trickier. Is there any method to the madness?