- It is possible to take such internal walls back down, also.
- Aside from these emotionally-charged self-built perception filters, there are also other perception issues which I believe are not emotionally connected, e.g. this sort of thing: http://en.wikipedia.org/wiki/Rubin_vase
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- Aside from these emotionally-charged self-built perception filters, there are also other perception issues which I believe are not emotionally connected, e.g. this sort of thing: http://en.wikipedia.org/wiki/Rubin_vase