Its not that strange. Lots of textures can look either way. I took alot of photos from concrete, and they look really like concrete. But adding the proper highlights and shadows to it, they easelly look like metal. And in Unreal and UT mainly metal and concrete often are switched.
The one texture is used as a base for another texture which is obviously metal, and on another occasion the same base texture is used to make an obvious concrete texture from. And textures can also be used directly. And yeah, some rock faces do resemble bark, and vice versa.
But its interesting that castle1 is used, as that package isnt used in any map. That makes me wonder if castle1 may have been created specifically for PSX.
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No, castle1 was from unreal alpha or somehting like that. There is also cryptpsx.utx which is basically the beta crypt(or crypt2 in UT) and there is also crypt2psx.utx which is all new package and has different looking textures! I suppose both come from beta versions though. There are some brand new textures for the psx though on the other side. But they are not that often.
EDIT:
[SCREENSHOT]http://img199.imageshack.us/img199/9411/andersonmap.jpg[/SCREENSHOT]
A map by John Anderson. I didn't know he worked on unreal psx.
I will never ever associate Utemple with temple of vandora since I played this map. I recognize one part of the map though and that is from some Unreal promo pics, that means this map is originally from Unreal, but modified for unreal psx. Nice! Except the map is mostly devoid of enemies and has no ending as well.
It has flies, few weapons and skaarjinfantry and that's it.
Other level designers revealed: Jakub Kisiel (from People Can Fly obviously, or maybe someone with same name?), Terry Greer
Screenshots from the Kisiel's level, it is completelly devoid of enemies and unfinished though:
[SCREENSHOT]http://img413.imageshack.us/img413/6615/jklevel3.jpg[/SCREENSHOT]
[SCREENSHOT]http://img511.imageshack.us/img511/5286/jklevel2.jpg[/SCREENSHOT]
[SCREENSHOT]http://www.unrealtexture.com/Hosted/Leo_T_C_K/UPSXbonus/jklevel2.jpg[/SCREENSHOT]
[SCREENSHOT]http://img339.imageshack.us/img339/4595/jklevel1.jpg[/SCREENSHOT]
[SCREENSHOT]http://img340.imageshack.us/img340/878/jklevel0.jpg[/SCREENSHOT]