Frost and flags

I was walking into the BARC (where I have my office and lab) after lunch the other day, when I came upon this scene:

Flags at the BARC

A closer look:

Flags at the BARC II

Who put them there, or why, we do not know.  But there they were and are.

Last night, hoarfrost started building up on things.  By this afternoon, my car was covered in it.  Hoarfrost can be amazing, with long fern-like feathers growing off of surfaces.

Hoarfrost on the mirror.
Mirror close-up
Frost feathers I
Frost feathers II

The best was the spiral effect the frost that grew on the antenna made.

Hoarfrost spiral on antenna