Capybara
Accessing a capybara presents significant logistical challenges for most humans. The species resides primarily in South American wetlands, with supplementary populations in select zoos and the homes of exceptionally dedicated enthusiasts. One cannot simply acquire a capybara through conventional retail channels in most jurisdictions.
However, the capybara makes no demands of those who seek it. There is no skill barrier, no equipment requirement, no prerequisite fitness level. The capybara accepts all visitors with identical indifference, regardless of ability or background.
Tennis
Tennis infrastructure spans the globe, with courts available in virtually every developed nation and many developing ones. Public parks offer free access; commercial facilities provide bookable courts for modest fees. The sport has achieved genuine geographic ubiquity.
Yet tennis erects invisible barriers. Equipment costs mount: racquets, balls, appropriate footwear, and membership fees that rise with facility prestige. Skill requirements create psychological barriers; few activities expose incompetence as publicly as a missed tennis serve. The sport is technically accessible whilst remaining emotionally exclusive.