This embedding is trained on a collection of Halloween-themed picture postcards from roughly 1900 to 1920, as collected by The Public Domain Review — an excellent source for pre-1928 imagery and design.

Improvements in printing technology and postal expansion (free rural delivery) created a boom in picture postcards in this period, becoming a vector for social exchange — especially around holidays — as much as a delivery mechanism. The spread of the telephone network ended the boom by providing an even quicker mechanism for long-distance communication.

The original postcards used in the embedding are from the New York Public Library, the Maryland State Archives, and the Toronto Public Library, among others. This embedding is based on 30 images cooked for a total of 300 steps on base SD 1.5: 16 vectors per token, a 0.004 learning rate, a batch size of 6, and 5 gradient steps.

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