Purple Notebook in dreams
A bound book of blank pages — private space reserved for your own thinking.
How purple changes the reading
Purple colour places the symbol between hot and cool — a reading that has both calm and intensity at once. The dream often uses purple for symbols that do not fit the usual categories cleanly. Take the reading more seriously than you would otherwise; the colour is asking you to.
The base reading of Notebook
A notebook in a dream is the dream's image of a private container for thought. The notebook does not perform; it holds what you have not yet said aloud. The dream brings the notebook when there is interior material in your life that needs a place to be written down before it is acted on. An open notebook with fresh entries is the dream telling you that the practice of recording your own thinking is, currently, doing its work. A lost or filled notebook with no replacement is the dream noting that the private container you used to use is no longer available, and your thinking has been left without a home.