Truesight

Perhaps it's just a trick of the light?

When the veil of magic is thin, Atticus' human form may grace you. This can be through reflections in water, mirrors, glasses, fluttering rays of light, or even with your own two eyes for fleeting moments. With murky blue watercolor eyes and a face kissed with freckles, you'll be sure to second guess yourself and do a double take. Maybe it's a sign there's still a little hope to bring him back to his original self from his curse.

Characters with truesight or those who can see through illusionary magic can see this form.