# An optical illusion work 'Transforming garage roof' where the shape of the roof is different when viewed from the front and what is reflected in the mirror

Mr. Kokichi Sugihara, who works as a special research professor at Meiji University, presented a work called 'Transforming Garage Roof ' in which the shape of the roof looks different when viewed from the front and when viewed in the mirror using

optical illusions.

'Ambiguous Objects' that change their appearances in a mirror --Kokichi Sugihara's Homepage (Japanese)
http://www.isc.meiji.ac.jp/~kokichis/ambiguousc/ambiguouscylindere.html

Normally, the shape of an object does not change when reflected in a mirror. However, Mr. Sugihara has created an optical illusion work in which the shape of the roof differs depending on the viewing angle, and publishes it on his blog.

The following is the 'transforming garage roof' announced by Mr. Sugihara. When viewed from the front, the roof is rounded, but when viewed from the back in the mirror, the roof has a zigzag shape.

You can see what the actual roof shape of 'Transforming Garage Roof' looks like in one shot by watching the following movie.

The 'transforming garage roof' is a rounded roof when viewed from the front, but it is a zigzag roof when viewed from the back.

If you rotate the base on which the roof is placed, you will see that the shape of the roof is quite distorted.

The mirror does not have any work done on it, it looks like a 'rounded roof' from a certain angle and a 'zigzag roof' from another angle.

When you lift the roof and turn it upside down, it looks like this. You can see that the roof was an unbalanced M-shape.

The reason for this is that we want to understand that the human brain has a flat cut that extends vertically from the center of the roof edge (red line).

By taking advantage of this characteristic, the edge of the roof is cut in a zigzag pattern so that it looks like a 'rounded roof' or a 'zigzag-shaped roof' from a specific angle.

The 'Transforming Garage Roof'

won second place in the 2015 Best Illusion of the Year Contest .

Using the characteristics used in the 'Transforming Garage Roof', several optical illusion works that change the image seen from the front and the image seen from the back reflected in the mirror have been released.

The illusion of a cylinder whose cross-sectional shape changes depending on the viewing angle, '

Ambiguous Cylinder Illusion, ' won second place in the 2016 Best Illusion of the Year Contest,and is in STL format for actual output with a 3D printer.The data is open to the public.