Research:Torqvald's Illusion Generatrix
It looks like illusions take up 15 mindspace. Haven't done extensive research, but needed 20 mindspace free to contain both an illusion and a size-5 spell (GCT).Rigrig 12:07, 26 April 2011 (UTC)
Indeed the illusions appear to take up mindspace. But also to note, the spells are re-castable (although the components are consumed every time). The spells can be stored in a spellcase and presumeably scribed also.