The Medford Public Library presents an opening reception with Medford artist Mary Sullivan Oliveira, whose exhibition “On Spot Pond” is on view at the library throughout December. Displayed are original watercolors Oliveira painted from a kayak on Spot Pond in Stoneham. Each painting represents a memory of time spent on the water. Oliveira’s work may be viewed in library’s second-floor gallery all month during regular library hours.