Jellby wrote:
> No, it's true, even though the light comes from below, I have no problem
> seeing craters and I just can't get my brain to "see" bubbles.

   It's just so strange. Even when I make great efforts to force my
brain to see craters instead of bubbles, I can't. I concentrate on
one of the circles, visualize the light coming from below (and a
bit from the left), adamantly think "ok, starting from below the
circle, the terrain goes *up* and gets more lighted, then there's
a sharp edge after which the terrain goes *down* as is thus darker,
after which there's a large depression in the ground, after which
the terrain goes again *up*, there's a sharp edge and goes *down*
again", it doesn't help. My brain still sees the exact opposite:
A bubble with its borders dug into the ground. No matter how hard
I try, I cannot get my brain to see a crater. Strange.

   I wonder what would happen if the image was re-rendered with the
light coming from the opposite side.

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