A promise is always most treasured when you are down and out. When you are at your lowest, you cannot imagine happiness. That is why we need to have a mental image that gives us hope. Israel had been in exile when Jeremiah gave this promise from God. So I imagine that their mental image is the land which was promised to them in Joshua 1 – where God promises to bring them back to their homeland.
The world is about to be flooded and there are still obstacles between the snails and the Ark. The sea between the Ark and the snails represents the obstacles the snails have to overcome in order to be safe from the flood. I chose to illustrate this because the Ark, which represents God, provides a sense of hope that motivates everyone – that no matter who you are, to face all your challenges and not give up.