/sci/ - Science & Math

>>8827678
You can't add a 5th shape that touches all other shapes without cutting off access between two other shapes. You may color these 4 shapes if that helps you visualize it.

In order to have 5 colors you have to have 5 shapes that touch all other 4 shapes. Start with an image that has all 4 shapes touching all other shapes. Then add a 5th shape to that image which does not block any other shape from another shape, yet touches all 4 other shapes. You don't even need colors for this.

>>8815820
>planar