NOTE; To get the most out of this exercise it's a good idea to do this with others and to see how different and diverse are your perceptions, play and favorites.
To explore LINE, start with blank pieces of drawing paper or a roll of easel paper. Size is good!
Collect, beg or borrow an assortment of black mark making media: Crayons, ink, paint, watercolor, pastel, different markers, charcoal sticks, even black yarn.
For 10 minutes or longer make all kinds of linear marks: wavy, straight, narrow, wide, bold, timid, shaky, confident, happy, sad, short, long -- you get the idea.
What are your favorite lines? Cut out 4 or 5 of your favs and collage onto one piece of paper.
An all-digital version of this LINE play, use an app (like NGA Kids) with various brushes to make linear marks. Edit, combine, layer and repeat!