Themes beyond human reach now...gravitational waves
Something we can't detect now don't mean they don't exist. For example, cancer cells hide somewhere we can't detect and come back later on. I heard this lab of gravitational waves, championed by Yang Zhen Ning in 1980s, at Sun Yat-sen University - the lab was led by Li Hua-zhong, former president of SYSU.
Another example, below, gravitational waves were not known until recently. What else?
Soul exists out of body, but we can't tell what's it now.
TCM works for thousands years for Chinese, but we don't have a sufficient mechanism to explain
now, but awaiting for revolution of themes.
You gotta think out of the box! Don't draw in the box. Forever and beyond. But, what's that?