Sometimes the past reveals itself even after the original structure/event has passed. It might add depth and dimension to our understanding of the place we occupy. Otherwise, we will likely label something irrelevant while missing an opportunity to be curious.
What was deemed entirely safe changed with more knowledge and time? What new information has transformed your understanding of reality? What everyday activities from your youth now make you reconsider adult oversight? How might we build in the ability to adapt and amend as new details reveal themselves?
A little more detail on the home Atomic Energy Lab.
If we shine the brightest light on our area of focus, it washes out the details. However, allowing light to appear from different directions and shadows to drift in might reveal features and understanding that we did not previously possess.
What-if-concepts 