No computer screen can replicate the experience of seeing a Chuck Close painting in person. There’s the way his mammoth portraits, several feet tall, can engulf you. The way their faces melt into abstract swirls of color, neatly organized like pixels on a grid, when you step close. And the way they snap back into people when you step back. It really is an experience. So if you find yourself in East Hampton, swing by the museum at Guild Hall where, until October 14, you can take in a new exhibit of mostly recent works — and delight in the artist’s plays of perception up close.