Boston is filled with two of our favorite things: blank pavement and crowds of people -- so it's only natural that one of our main goals is to unite pedestrians with the art around which they suddenly find themselves. Essentially, we help passersby literally become part of the creation as they are invited not only to watch us draw, but also to take a piece of chalk and add their own masterpiece.

Some choose to draw a quick picture, others write a short note or even a poem. Some claim to be horrible artists, others appear to be the next Henri Mattisse. In the end, anyone who is willing has something to add, and by the time we're done, the sidewalk becomes a canvas filled with the expressive creations of a populous.

Chalk is temporary and erasable, so our creations might last an afternoon, or might be washed away in seconds in a torrent of rain. But for a moment of someone's day, the sky is the limit and the sidewalk is the pallette.

On this gorgeous day, we descended upon Boston Common. All our members were invited, and we in turn encouraged any and all passersby to join in the fun.

Some of the photos:

Colorful creatures begin to take shape.

We drew a Jump to Conclusions Mat, and to our delight, people began to play!

One of our favorite chalk elements, "Beginner's Hopscotch..."

...and for the more mathematically-inclined, "Advanced Hopscotch."

When the sun lies low on the horizon, it's always a blast to draw elongated shadow outlines.

Trying to explain "Advanced Hopscotch" to passersby is as fun as creating it!

Urban Canvaser Peter touches up a masterpiece.