Prof. Hui-chung Leung’s presentation focused on visual illusion. The visual illusion doesn’t necessarily represent that our eyes, vision cells, or our brains are damaged. It’s just that our brains are tricked by colors or shapes of an object. If the cortex gets damaged, we lose the signal and it appears as partially blind. In our brains, there are more than 30 different regions that process signals from different aspects. This is a complex cellular circuit. One of the surprises of this presentation was the experiment with the “Gray Surface”. When we cover the edges of the connection between two different gray squares, the colors of the squares become the same. Another experiment was two Rubik’s cubes with different colors on different backgrounds. The conclusion of the experiment was “Some spectra can generate different color perception” and “Different spectra can generate the same color percept.” 

This knowledge of neurology is of great help to art students. It can help us better understand the relationship between colors and the phenomena they produce. For example, which color should be used for painting? Shadows in photographs are always gray, but an oil painting, they are completely different. A painter cannot simply use a “pure” gray mixed with black and white. Unless the painting is presented in black and white. In addition, in photography, a good color ratio can help the audience better understand the meaning of the work. Which collections are high contrast, and which collocations will give your brain an illusion.