We put a man on the moon before we thought to put wheels on suitcase (see this article around the timelines if you need proof).

This is a great comfort to me.

It tells me that there is always more to come. Unthought thoughts. Not just the inconceivable but the downright obvious, they just haven't occurred to us yet.

If you're stuck, there's always the possibility that you haven't realised the simplest solution, but looking to where you've always looked might not be the source of the answer.

Where would it be helpful for you to do the equivalent of putting wheels on a suitcase?

Tip : if you're stuck, don't think harder... wonder