The animation art is, of course, the rabbit's house from ALICE IN WONDERLAND, for which Mary Blair's color styling was a tour de force.
The photo is from Disneyland's 10th anniversary TV special. Walt was giving official Disneyland ambassador Julie Reems a tour of "things to come," which included Mary Blair designing the "Small World" pavillion.
(Note the quintessential Mary Blair color styling of her own outfit, two different hues from from the blue palette!)
"In" jokes have been part of the Disney animation department from the beginning.
So you tell me... Does this house look like Mary Blair?
:)