After the initial results presented in 2015, many new additional papers and blog postings were presented about DeepDreaming:

• DeepDream: A code example to visualize Neural Networks--https://research.googleblog.com/2015/07/deepdream-code-example-for-visualizing.html
• When Robots Hallucinate, LaFrance, Adrienne--https://www.theatlantic.com/technology/archive/2015/09/robots-hallucinate-dream/403498/

In addition, it might be interesting to understand how to visualize each layer of a pretrained network and get a better intuition of how the net memorizes basic features in lower layers and more complex features in higher layers. An interesting blog posting about this topic is available online:

• How convolutional neural networks see the world--https://blog.keras.io/category/demo.html