Founder of www.specialist.design and @projectnoah. @readymag advisor.
Optical weight is how human eyes perceive the size and significance of an object, and it doesn’t necessarily equal its pixel size.
The easiest test to check visual balance is blurring the items. If your icons turn into more or less similar blobs, they have the same optical weight.
Elon Musk is also good at a very specific type of learning that most others aren’t even aware of — learning transfer.