The final painting is executed in watercolor. No ink line or opaque
paint is used.
"Im often asked
where I got the idea for Tuesday. The question is usually
accompanied by a suggestion or two. Did I have a pet frog while
growing up? Do I live near a swamp? Do I have a 'thing' for frogs
. . .? The truth is that the imagination needs no outside stimulus."
>> read more of David
Caldecott Medal acceptance speech