Understanding the Word 'Palpable' in Context

Read the following excerpt:

'Beneath the clouded sky, the town's ancient architecture stood with a certain stoicism, unwavering against the relentless passage of time. The cobblestones, worn smooth from countless footsteps, seemed to echo the whispers of history. Yet, in a stark contrast, the vibrant art installations springing up around the streets brought a palpable energy, infusing the air with creative fervor and lively discourse.'

In this context, the word 'palpable' most nearly means: