Portfolios are grouped thematically as strikes my fancy
Just because they are tenacious, are historic objects more worthy of study? Or can processing make modern items look historic, steampunkish, ancient? History is a passion of mine, and ghost towns or archeological treasures make for wonderful subjects. Early ships and planes, as well, remind us of how far we've come, and techniques can be
Man made objects, things, attractive because of context shape or color
The night sky as a compositional element in landscapes. This is one of the hardest kinds of photography to do, requiring deep knowledge of how digital sensors work, strong post-processing skills and specialized equipment
Infrared captures wavelengths of light that the human eye cannot see - it's a photo of invisible color, and in some ways, showing more than a "normal" shot. Distant details become visible, as haze fades away. Ordinary objects get imbued with a magical crispness, as if lit with the eighth color of a seven color spectrum.
Light hits mountain peaks in so many different ways - the warmth of dawn, the foreboding of a thunderstorm, the coolness of reflection on a snowy cap. Light can be used to show off the sharp crags or the round eroding hilltops and high meadows.
Capturing the emotion, the scene, in a low light environment calls for a lot of preparation and knowledge of how the equipment will react. Shooting the stars behind a mountain, a string of holiday lights on a dark night, or an evening street vignette are completely different, in some ways, but all use the same principles of night shooting.
Form follows function, or was that the other way around? Either way, the composition shows the pattern, the color, and sometimes the action, and highlights the uniqueness of the individual shape.
The camera can speed up water, or slow it down, as it drips, dances, cascades and geysers. It's endlessly fascinating and the same frame can show many moods.