Changes: Order and Disorder

The hourglass: The glass is silicon dioxide (SiO₂) and the sand is as well (ignoring slight impurities like sodium and borate). SiO₂ is the inorganic analog of carbon dioxide. Both are chemically spent, meaning they have no chemical energy left to give in a world surrounded by O₂. So an hourglass is made from two forms of the same thing. There aren't too many substances that do that at the chemical level. Glass and plastics come to mind. 

I wouldn't call glass a different "phase" than sand is -- they're both solids. But glass has no real microscopic structure whereas sand does. Pure elements do sort of the same thing when they form allotropes. I suppose that water does it when it forms different types of ice -- some crystalline and some amorphous. But water is unique in forming mixtures of water and ice. Here's a pretty photo of water & ice and sand & glass:

Maybe adding a little dry ice could liven things up. just to keep carbon in the picture.

Beset By The Moon

That is the moon setting early this morning. The reflection comes from the bare ice of a skating rink. Here it is later in the day:

And here is the moon set again but with the exposure amped up:

Changes: Seasonal and Phase

Morning ski trails on a local lake: 

The newer path diverging left is incuse while the older path on the right appears in relief. This effect is from snow melting around the compacted tracks; the relief tracks will indeed be some of the last traces of winter as the snow reverts to its liquid state. 

Another view under different light:

incuse right; relief left

Some tracks were pocked by leaf prints:

Closer up:

The leaves were not passively revealed by melting; rather, they blew in from shore the previous day and due to their darker color they melted in place, actively boring through snow and ice. In this small way the old season hastens the new. 

Status Quo vs. The Party Of Change

"...two important aspects of inorganic chemistry (in fact, of chemistry in general) are structure and reactivity.  Someone has said that all of physical science consists of this duality. In physics we could speak of statics and dynamics, and by analogy in everyday life, the status quo and change."

~James E. Huheey Inorganic Chemistry: Principles of Structure and Reactivity 2nd Ed

Yoga practice fits nicely into that dichotomy when juxtaposed with aerobic exercise. Yoga is rather static and structural, consisting of lots of stretched poses. Cross-country skiing--which I've done a lot of lately -- is very dynamic. I'm now doing both on a daily basis. 

Another analogy is political: Conservatism is inherently status quo; the other wing is by nature about change and dynamics. Best to take a little of both in measured doses.