One important statement here is dhyayen manomayam. Manomayam is not imagination. Impersonalists think that the yogi can imagine any form he likes, but, as stated here, the yogi must meditate upon the form of the Lord which is experienced by devotees. Devotees never imagine a form of the Lord. They are not satisfied by something imaginary. The Lord has different eternal forms; each devotee likes a particular form and thus engages himself in the service of the Lord by worshiping that form. The Lords form is depicted in different ways according to scriptures. As already discussed, there are eight kinds of representations of the original form of the Lord. These representations can be produced by the use of clay, stone, wood, paint, sand, etc., depending upon the resources of the devotee.