Blood Echoes hides an Easter egg in the black and white artwork on page 228.
Each of the little dials stand for a letter of the alphabet. They spell the alphabet, a Bloodborne quote and the words Hunter and Yharnam.
“Here we stand, feet planted in the earth, but might the cosmos be very near us, only just above our heads?”
– Cosmic Eye Watcher Badge
The top and bottom dials spell “Hunter”, the lines in the center spell “Yharnam”.