Monday's ^gentle^ brain teaser, it will leave you ^square eyed^. ??????

Good morning virtual pupils, here is today's problem. No I don't mean those troublemakers, Gilly and Doodle! .
Many years ago, I had to lie flat for a couple of hours, whilst having a full body scan done. I passed the time, counting how many squares were on the ceiling. ?
The difficulty is that four square ceiling tiles together make one large square, so I kept losing count. The radiographer thought I was mad.
That was a hint to the solution, by the way.