Ok, it is a safety hazard, but it does lend itself to some exciting photography!
This image shows two bald-faced hornets (Dolichovespula maculata) adding on to the outside protective cover of the nest. The visual design is really intriguing to me. A closer look reveals that each subtly colored streaked segment is one hornet's work with one tiny ball of chewed up wood fiber - the different colors coming from various sources. That's a lot of work! And each individual's effort does make for a unique overall design.
Zooming in on the picture shows a little more detail.
Zooming in even a little more...
Kind of surprising, what you can see up-close, isn't it?