Non-Thinkamancers are kept under the false impression that a Thinkagram is a single type of spell. There is actually a spectrum that a Thinkamancer can choose one or more bands from to communicate within.LIAB Text 38 The bare minimum is spoken word without inflection,Hvs.tCF 195 but a Thinkamancer can make the Thinkagram more immersive by using Thinkspace, in which the participants communicate in a sort of mental world using avatars of themselves.Hvs.tCF 210, for instance.
One of the more common, non-Thinkspace forms involves projecting a floating, visual image of the target with Foolamancy before the recipientErf-b1-p109, allowing other Units in the vicinity to observe the effect. Anything spoken by the target is heard by the recipient and other observers. If the two-way version is cast, an image of the recipient is displayed to the target and anyone observing the casting: anything spoken by the recipient is also heard by the target and observers. For the duration of the Spell, the fingers of the Caster are held in a rectangle, index fingers to thumbs of opposite handErf-b1-p068, as a Director or Photographer might in a TV show. The image of the recipient appears in front of this rectangle.Erf-b1-p091
Words need not be spoken aloud during a Thinkagram, and can be mouthed out and mentally projected instead if stealth is necessary.Hvs.tCF 102
Prisoners cannot normally receive Thinkagrams, though there are ways to work around this.
If a unit touches a Thinkamancer, the Thinkamancer can form a connection to them. If said unit concentrates on visualizing said Thinkamancer's appearance, the Thinkamancer will detect this and know they want to make a call.Hvs.tCF 247 This is the means by which Thinkamancers in the Magic Kingdom get contacted for their services and make their upkeep.
Given the fact that a Thinkamancer can do a single long conversation, or multiple short ones, it is possible that majority of the juice cost is spent initiating the Thinkagram, with a smaller amount needed to maintain it.