Here is all that's left of the wall drawing experiment I fretted over. In the end, I did take my class out to create some blocks of squares and circles to go with our schoolwide art show theme. We've had one or two downpours since then, but mostly it is a dry season now. The colors have faded in the sun and there is nothing to wash the dust away.The ugly remnants remain unmoveable, like footprints on the moon.