Anamorphic illusions of items on a desk is the latest of many interesting original visual illusions, tricks, and fun science experiments by Brusspup on Youtube (previously). For handy viewing: Anamorphic playlist; Illusions playlist; Science experiments playlist, plus more, including a playlist of how-to videos for various tricks and activities . [more inside]
Entoptic phenomenanotographs [via Flickr]. Entoptic phenomena are visual effects whose source is within the eye itself. This is a photo set of nothing but entoptic phenomena... as well as a few invisible men.