An optical illusion is read as a reminder that things are not always as they appear. Dream tradition takes it as a prompt to look again at a situation where first impressions may be misleading.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.