Going deeper with the chakras

I have just read a page from Swami Venkatesanada's talks at Yashodara Ashram and he shares some fascinating perspectives on the chakras. He says that really we can't prove where the chakras are, we can only imagine them as being placed in certain locations while taking the image-in. Some people can verify the exact locations through their study of scriptures, but really we can't know. We can only experiment for ourselves. He is however, passionate about visualisation and sees the many different images given for the chakras as a way to go deeper and deeper eventually absorbing your self into the root of the image. In other words you start with the simplest image at the base chakra which is the yantra of the golden square and then like a complex tibetan buddhist yantra you can add more shapes, animals, deities and so on... the same thing occurs with the sounds at first you visualise the four sanskrit syllables on the four petals of the lotus until they are absorbed into the one sound which is LAM. Lam is then absorbed into the next chakra like earth settling to the bottom of water in a flowing stream. I am quite inspired by his description as it gives me permission to be as simple or as complex with my visualisations in meditation. Sometimes I need to see each aspect and other times just the sense of it balancing through the mantra and yantra is enough.....