Surfing on YouTube today I’ve found this interesting illusion. When you look at it for the first time this look like a house, or a 3D object, but in fact this is a sculpture art at National Gallery Scupture Garden in washington DC, and a great illusion as you might see in this video. I’m sure that behind this house illusion is the dragon illusion that can be seen here. A dragon like that can be made by following this PDF if you are interested.