i noticed that too?? its a projection.., ill go back in and fix it asap.., atm.., im doing a sound design for a short film in readiness for an ADR here on Thursday night
thanks for you input, much appreciated.., im amazed someone else noticed the pipe texture too 
take care.., ill be putting smoke in there too to give it a darker more ominous look.
cheers
take it easy and life will be easy