(aviation) An illusory perception of one's pitch angle, due to the effects of linear acceleration on the vestibular system of the inner ear.

An optical illusion in which the parallel straight dividing lines between staggered rows with alternating dark and light "bricks" appear to be sloped rather than parallel.

Alternative form of no human being is illegal

To consider undocumented immigrants to be illegal immigrants is illegitimate.

(linguistics) An indigenous Algonquian language spoken in the United States, primarily in Illinois, Missouri, Indiana, western Ohio and adjacent areas along the Mississippi River.

A cognitive bias by which people wrongly think that they have direct insight into the origins of their mental states, while treating other people's introspections as unreliable.

An optical illusion where, when a diagonally striped pole is rotated around its vertical axis (horizontally), it appears as though the stripes are moving in the direction of its vertical axis (downwards in the case of the animation to the right) rather than around it.

(computer graphics) The realistic lighting of a rendered scene by means of algorithms that take into account not only the direct illumination from light sources but also the indirect cases where light is reflected between surfaces in the scene.

An optical illusion in which an arrangement of horizontal and vertical bars of various lengths may be viewed as either a series of rectangles or a series of circles.

A microscopic technique where light is projected at the specimen from an oblique, slanting angle to reveal features with higher contrast.