By the Things That are Made
My mum send me this picture:
A bit like the verse below really.
For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
- Romans 1:20-21 (KJV)
It's clear from the squirl. No excuse. 