The towering trees that give the park its name naturally obstruct some sunset views from directly below the foliage, too, so the few vistas that allow unspoiled views become even more sacred.

Be arrogant will not only encumber you from having good relation with others, but also obstruct you from getting progress as well.

Newtonian and catadioptric telescopes have secondary (or diagonal) mirrors that obstruct a small percentage of light from the primary mirror.