A virtual Easter egg is an intentional hidden message, in-joke or feature in a work such as a computer program, web page, video game, movie, book or crossword. – wikipedia
find the keywords ( direct links quoted ) which reveal hidden Easter Eggs embedded by the creative developers at Google. What’s your favorite.
keyword ‘do a barrel roll’ ( https://www.google.com/search?q=do+a+barrel+roll )
keyword ‘askew’ ( https://www.google.com/search?q=askew )
keyword ‘recursion’ ( https://www.google.com/search?q=recursion )