And just image them circumnabulating that thūpa, contemplating the teachings they would have heard from the good monks, maybe thinking of their saddhā , maybe thinking of their virtue, maybe contemplating nāma and rūpa—reflecting on the fact that what is seen when they look at the thūpa is just visible object appearing through the eye-door in a sense-door process—no person, no being, just impersonal processes; perhaps contemplating the lessons they learned from the artistic reliefs that lined the walls of the tunnel they just walked through at the Wat since its walls were lined with painted releifs of Jātaka Tales and other Buddhist depections to teach moral and other lessons*—since like many of the visitors they may not have been able to read. Even years later they could reflect back on those times at the chedi where they contemplated what was heard and seen when they visited that holy place. They could also conetmplate the merit they made through giving offerings, circumnabulating it, etc.
*The tunnel walls were originally lined with such depections, but because the Wat was abandoned—likely in the 15th-century—it became overtaken by the jungle and the tunnels were filled with over a metre of sand and soil by the time restorations began in 1949. The restorations were conducted by Chao Chuen Siroros and many locals who established a meditation center there and reopened the monastery offically calling it Wat Umong (Suan Phutthatham). During the renovations, there was so much sand, soil, and debris in the tunnels that much of what was left of the paintings was destroyed, though some of the paintings still remain and have been restored.
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