Thanks! Equipment on all four were taken with a Sony Alpha A7s with 35mm lens. I haven't thought about printing any of the Primitive images, but mostly because I only downloaded it about 20 minutes before posting these images. They might look interesting on canvas, tempting!

Too late to edit my comment, but I added a couple more photos if you want to check them out. A night scene that I thought would be a tough test (hard to do stars!) and some columnar basalt that turned out great.

It's just a simple jQuery plug-in called Twenty Twenty that I found when I had the idea to take the same picture at different times and compare the result. Drag/swipe across ended up working better as an effect than my original fade-in idea. You can view source to see how it works, it's really simple.

http://zurb.com/playground/twentytwenty

Here is the photo that kicked off my idea:

http://www.jongales.com/rainier/timeshift/

I also did another in the Spring that turned out nice:

http://www.jongales.com/timeshift/columbia-river-gorge/

Playing with that comparison, it looks like there's a +y bias in your algorithm. If I didn't say that in a way that's clear, check out the Mowich Lake picture in particular. Its features are mirrored above and below the shoreline, so the generated features should also be somewhat mirrored, right?

Instead, the entire visual center of the image gets moved up by the Primitivization. It looks like trees on the top half get their exposed tops connected, but those same crowns are cropped in the reflection.

This is such a phenomenal project. Thanks for making it!