Drop attacks stem from diverse mechanisms including leg weakness and knee instability but have also been attributed to transient vertebrobasilar insufficiency, epilepsy and unstable vestibular function among other reasons. Those afflicted typically experience abrupt leg weakness, sometimes after sudden movement of the head. The weakness may persist for hours. The term drop attack is used to categorize otherwise unexplained falls encompassing a wide variety of etiology and is considered ambiguous medical terminology. Drop attacks are currently reported much less often than in the past, possibly as a result of better diagnostic precision.[wikipedia]
Ilinx is type of play that destroys order and stability of perception.
Racing downhill or sledging create the conditions of ilinx. Ilinx is a category of play that relates to the experience of a fall, a space of disorder based on the pleasurable pursuit of vertigo. According to Caillois, other physical activities that produce ilinx include, “the tightrope, falling or being projected into space, rapid rotation, sliding, speeding and acceleration of vertilinear movement, separately or in combination with gyrating movement” “Man, Play and Games” by Caillois (from Emma Cocker, “Over and Over, Again and Again”)
Experiencing the clouds is opposite then feeling grounded — both in the literal sense of being planted on the ground, and in the figurative sense of feeling stable, knowing, locked into a predictable pattern. Just the opposite, a feeling of unsteadiness and unstable ground is required. Here it is supplied by simply destabilizing the body and by replacing visual reference points.
Bas Jan Ader: