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Sometimes the Buddha was invisible.
MN49:26.10: And while invisible I recited this verse: ‘Seeing the danger in continued existence—that life in any existence will cease to be—I didn’t welcome any kind of existence, and didn’t grasp at relishing.’
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The Marks of a Great Man Lakkhaṇasutta
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The Buddha said this: Bhagavā etadavoca:
“There are thirty-two marks of a great man. A great man who possesses these has only two possible destinies, no other. “Dvattiṃsimāni, bhikkhave, mahāpurisassa mahāpurisalakkhaṇāni, yehi samannāgatassa mahāpurisassa dveva gatiyo bhavanti anaññā.
https://suttacentral.net/dn30/en/sujato
Further discussion.
https://dhammawheel.com/viewtopic.php?f=13&t=28550&hilit=Buddha+look+like