At Bloomington’s Earth Day celebration Saturday at Switchyard Park, visitors helped build a sprawling sand mandala, adding colored sand by the cupful, handful, or grain-by-grain. Winners of the city’s Eco-Heroes Art Contest displayed their work inspired by this year’s theme, “Our Nature at Night.”

At Bloomington’s Earth Day celebration Saturday at Switchyard Park, visitors helped build a sprawling sand mandala, adding colored sand by the cupful, handful, or grain-by-grain. Winners of the city’s Eco-Heroes Art Contest displayed their work inspired by this year’s theme, “Our Nature at Night.”