Yes, the "trees"(<--extreme case), "grass"...all terms to describe the white noise associated with viewing a UT screen....just couple to anything, switch to a very narrow screen(ie 1" scale), crank up the gain...you'll quickly see what we were talking about....I really doubt is was meant as off color or derogetory. In this "grass" it is very possible to miss indications.
Take a quick look at this: The .060" side drilled hole is in all that "grass"(noise)......