See also Alice in Wonderland syndrome (AIWS)

“…a disorienting neurological condition which affects human perception. Sufferers may experience micropsia, macropsia, and/or size distortion of other sensory modalities. A temporary condition, it is often associated with migraines, brain tumors, and the use of psychoactive drugs. … Anecdotal reports suggests that the symptoms of AIWS are fairly common in childhood, with many people growing out of them in their teens. “

Lewis Carroll suffered from migraines.

I used to get this when I was younger.