oh you just brought an old memory:
when i woke up as i kid first thing i would see would be a geometric pattern
i thought oh god i can do things with the sight, i was seeing in 3d
edit:
now that you mention it:
all times i managed to see 3d in real life i was doing exercises of theoretically imposible interhemispheric fusion like drawing with that odd technique or just by meditating while seeing double
currently im practicing seeing double to develop the corpus callosum of the brain and i see a blue hue often on peoples head i wonder if its some kind of aura