Face-vase illusion
![271_e13d3481-873b-4e3c-b79a-c49c96a7be9f.png](https://secure.tutorsglobe.com/CMSImages/271_e13d3481-873b-4e3c-b79a-c49c96a7be9f.png)
(a) What is an upper bound on the complexity of a pattern on an m × m grid that has mirror-image symmetry about a vertical axis through the center of the grid and consists of horizontal line segments?
(b) What is the complexity K if the image differs in one cell from the pattern described above?