Giant Swivel head illusion - Buttercup the cow (Sneak preview from eChalk)

Here’s a sneak preview of a giant swivel head illusion I made for the upcoming Association of Science Education conference in Reading 2015.
But Buttercup won’t be alone at the ASE exhibition; I’m now busy working on monster size versions of Gruff the dog and Boxer the horse. If you’d like to see them in the flesh then be sure to visit the eChalk stand.
If you’d like to make your own you can download the templates here:
www.echalk.co.uk/amusements/Op...

[@EmilKukoly]

Great work. You wouldn't know where I could find the dimensions for the lifesize illusions? I'm not interested in printing one, I want to make a large one by hand. Awesome work!

[@eChalkeducationLtd]

Just scale up the template found here: www.echalk.co.uk/amusements/OpticalIllusions/SwivelHeads/SwivelHeads.html

[@Docrine682]

Be brutally honest: *you have to clue how you got here*