I just remembered something I used to do...totally forgot about it for the longest time though, and I just tried it a second ago and it didn't seem to work =/
Anyway, I started noticing it around middle school, I could stare at the ground, and it would start to move. Sometimes it would ripple and wave like water, sometimes it would shift around like wind blowing sand.
Had this happen sometimes with other things, as well...I remember one time staring at the horizon at night, and it started to look as if it were a sheet, with something behind it poking at it, trying to rip through.
Just wondering if anyone else has this, or has heard of it...I'm just hoping it's not like a seizure or something scary like that
![Mad :x](./images/smilies/icon_mad.gif)
If you're not literally hallucinating, you're probably just stareing too long, which causes peculiar persistence-of-vision anomalies or optical illusions.