Solar flow

Pinhole beercan solarograph test. Unfortunately fell off the downpipe I'd put it on today so developed 2 months early. Here's the negative version:

Here's 2 positive images done in photoshop:

Prefer the second myself but wonderful how this simple idea works with no chems, just a lot of time and better cable ties :). It was in situ from 3rd October to today.

Here it is (was) in place:

Here it is after opening