Not really, but helpful to better memorize. On a brainfart, so to speak, I could translate 242 to NRN, the major system and thats my hint that its Narnia. Or vice versus, knowing the image was Narnia and turning that into 242. So a basic image of a classic Narnia lamppost in the snow to represent 242; a normal 3 digit major system. But I could break down a two card combination presented too, ie. Q
2
or Q
2
, which both systematically will also equal NRN. On the other hand, for cards, if there is no face card in the two card combination, it would use something similar to Ben system instead of Major. Q2 or Q2 could also be NON so in my case the NonSuch ship. This means 242 technically has two images. But not all 3 digit numbers will have two images. More details here
Its the fact I can break all these down that helps if your in a Jam, but I believe the logic helps it sink-in too.
Palace is just to assist memorizing them all and its awesome to have 1000 locations in rock solid sequence.