Instructions for making things public has changed since the tutorial -- I ended up just disabling all the various public ACL kinds of options under Permissions, and then it allowed me to make them public
After uploading new files (overwrote existing) I had to go up to higher dir and use context menu, "make public" to get them to be readable -- if it doesn't show you images during development in sandbox etc, then the files are not readable!
Current version: runs image through V1 filters and then inverts back out using random selection of max pool unit -- fairly unrecognizable but definitely gives an overall impression of shape..
Previous: turns all the blue background color to white, and everything else to black, and then blurs the resulting image with a bild blur.Box convolution filter with a radius of 25. Produces pretty blurry images.