insanity
癲 centers on a disordered state of mind: insanity, madness, or mental derangement.
癲 combines 疒 (sickness) with 顛, which likely contributes both sound and the idea of the top or head, suggesting a disorder affecting the head or mind.
The sickness enclosure 疒 wraps around 顛, a shape associated with the top or head. Picture a sickness that overturns the mind, leading to insanity.
For テン, imagine a person with insanity scribbling the number ten (テン) over and over on a wall: ten -> テン, and the repetition reflects a disordered mind.
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epilepsy; epileptic fit
Jacksonian epilepsy
photosensitive epilepsy
traumatic epilepsy
insanity; insane person
madhouse; lunatic asylum; mental hospital
madness; insanity; lunacy
asylum; bedlam
(an) epileptic