Assume two characters, a summoner and a wizard. (The wizard is, in theory, not necessary, but let us assume them anyway.)
The wizard has learned the Path of Creation spell Chimera (Creation 80).
Said wizard then casts that spell upon the summoner, turning them into a Gnosis 25 Being Between Worlds, granting them DP, et cetera.
Due to being a Being Between Worlds, the summoner is summonable.
Can the summoner use their summoning abilities upon themself (and if so, what would happen if they did?)?