Probably the Shangpa Kagyu version of shi-nay/shamata. If I remember correctly it is a series of forms & colors representing earth, wind, fire & water, etc.
Do you want to invest a lot of your time and effort in doing shi-nay? It isn't easy. But if that is what you wanted to do anyway then it is an excellent practice and you should make the effort to go. But if you're only doing Dharma tourism, maybe it's not worth the effort to simply get some karmic seeds.
There is a tradition of making a distinction between two different perspectives on the nature of emptiness: one is when emptiness is presented within a philosophical analysis of the ultimate reality of things, in which case it ought to be understood in terms of a non-affirming negative phenomena. On the other hand, when it is discussed from the point of view of experience, it should be understood more in terms of an affirming negation.