When it comes to partnership, some humans can make their lives alone - it's possible. But creatively, it's more like painting: you can't just use the same colours in every painting. It's just not an option. You can't take the same photograph every time and live with art forms with no differences.

This quote is saying that some people may be able to manage life on their own without being in a partnership, however, having a partner can help with creativity. Just as painting a picture requires different colors, taking a photograph requires different scenes and angles, and art needs variation, having a partner to help can lead to more creative ideas. Being alone for too long can lead to people having the same ideas, but having someone to help can result in multiple unique views.