Passage Summary: An art critic thinks we don't appreciate art like we used to because we just snap a quick photo and keep walking instead of standing and staring.

Conclusion: Modern people are less willing to engage with works of art than people were in the past.

Reasoning: Museum visitors today rarely look at art for more than a minute and often just take a photo before moving on.

Analysis: The critic is making a huge leap from 'behavior' (taking photos and moving quickly) to 'internal state' (unwillingness to engage). For this argument to work, the critic must assume that spending a short amount of time or taking a photo is incompatible with deep engagement. If it were possible to engage deeply with a piece of art in under a minute, the critic's evidence wouldn't actually support the conclusion. We are looking for an assumption that bridges the gap between the time spent and the quality of the experience.