On Monday, while cleaning out a box of old school teaching papers, I found three crayon Op-Art samples I made when I was teaching middle school art 35 years ago. I was able to cut two envelopes from each 12X18 paper. From the scraps, I cut small circles (my favorite shape along with squares) to embellish the envelopes. Envelopes numbered 26.4 to 31.4 are the result.