One of the reasons that people love Disneyland and Walt Disney World is that these places are truly magical, a veritable feast for the eyes. Employees at the theme parks work hard at creating illusions so that you see what they want you to see, and the more mundane things -- trash containers, air conditioning units, service buildings, etc. -- tend to fade into the background. To do this, the parks’ so-called Imagineers developed paint colors such as "Go Away Green" and "No See-um Gray" to make the more unsightly things in the Magic Kingdom far less noticeable.
Now you see it, now you don't: