It's a powerful illusion of the material plane.
Pre-exam quizzing may act as an early warning system for students, showing them that they have the illusion of knowing the material but have not learned the material sufficiently for accurate recollection in a testing environment (Koriat and Bjork, 2005).
One Supreme Mind, or God, is charged with the daunting task of organizing the conscious experiences of all the finite minds so as to sustain the "illusion" of an independent material world with which all these minds are in mutual interaction.
The shock front is what we see as the edges of the nebula; the hollowness inside is an illusion, as there's plenty of material inside the nebula, but it does not glow with excited atoms.
While an inventory might prove useful for keeping track of nuclear materials, they said it provided only the illusion of security for biological materials, even those only found in laboratories.
The work of this exceptional young artist, based in India, is about the play of material solidity and illusion.
It simply creates the illusion of transparency through a meta-material technology called Retro-reflective Projection Technology (RPT).
There is something soul-destroying about the manufacture of illusions, she seems to suggest, particularly when they are made of material as dear to us as a home.
High ceilings and a bay window covered with glossy deep pink material lend an illusion of relative spaciousness.
