<p>cafe, that’s correct. Yale students use wallets with a place for their ID card on the outside. You see them waving their wallets to get in the gates to Old Campus, to get into their entryways, to get into the library, the courtyards to residence halls, etc. They prop their own room doors open at times, but only when in the room. </p>
<p>On Old Campus, anyone not between the ages of 18 and 22 looks really conspicuous, and would probably not have much success talking a Yale student in to letting them into a residence hall, unless they are a mom carrying a futon.</p>