Ubiquitous!

Note the rollers on this "raft."  This is a screen shot from a TV show, the kids had to pole the thing across the floor, handing a roller from the back to the front as they went, like moving those giant heads on Easter Island.  They made it look like fun, but then again Thai people can make anything look like fun. 

The rollers are pieces of what I call "the ubiquitous blue PVC pipe."  You see this stuff all over Thailand, in all guages and used for such various purposes that it is almost unbelieveable.  For instance, I have seen it used in the creation of everything from a TV antenna to a golf club.  It is very common to see a section of this pipe used as a mailbox.  And, of course, it's the plumbing in most homes.