I perceive the earth as round. No, it doesn't look round when I look out my window. But I have witnessed stars rotate about the sky. When I visited Australia I made note of the different set of stars rotating in an opposite direction. I have seen with my own eyes several Foucault pendulums, most recently the California Academy of sciences two weeks ago during a vacation to San Francisco. I have lived on a boat for two weeks without land in site, surrounded by 360 degrees of pristine and clear horizon. I saw the land rise up from the endless blue on the journey back to shore (not appearing out of a haze). I have seen planets and galaxies through telescopes large and small. I have enjoyed the benefits of GPS and predictions from the weather channel. I have personally struggled aiming a satellite dish on the roof of a house boat while the people down below scream at me as the signal strength changes with my every movement. I have spent hundreds of hours conversing with my grandfather who proudly worked on Apollo 11 as an engineering manager. I myself went into engineering as a result of his inspiration.
The earth seems pretty flat to me. I do not feel this way because of indoctrination. The shape of the earth, beauty of the universe, and marvel of technology were developed over many years of humble personal observation.
I prefer to form my perceptions by getting out and experiencing the world. Simply looking out my window just isn't enough for me.