The second one is charging hourly. We tend to prefer hourly fees on projects that are particularly open ended or very small scope. Our hourly rates are currently between $60 and $120 per hour depending on who is doing the work.
The word sonder exists, though. It means to probe, and in a more specific use, to test the depth of something. The word sound (as in the water feature) is a cognate, both related to the Old English sund meaning to swim, or the sea. I can't really think of an English equivalent that's specific beyond mere awareness.
What does Leander mean? Leander [le-an-der] as a boys' name is pronounced lee-AN-der. It is of Greek origin, and the meaning of Leander is lion man. Greek mythology: Leander swam across the Hellespont to visit his beloved, Hero. Saint Leander (seventh century) was a Spanish saint. Associated with: greek, lion, mythology, hero, saint.