Writing letters, pictures, symbols, etc. without any permanence.
How to Remove Gum, Paste, or Sticky Substances; Walking with High Heels on a Dirt Ground; Removing Twigs, Pebbles, etc. with One's Foot;
What makes " שכר שבת בהבלעה" (shabbos earnings included with weekday earnings) different from regular "shabbos earnings".