Caviar, Cream Cheese, Scallion, and Egg Towers

In a bowl beat cream cheese until fluffy. Quarter eggs and with back of a spoon force through a coarse sieve into cream cheese. Add scallion and stir well. Filling may be made 1 day ahead and chilled, covered. Bring filling to room temperature before proceeding. On a work surface arrange 2 egg sheets, side by side and overlapping by 1 inch. Put a dab of filling between sheets where they overlap (to act as glue) and press sheets together gently. Spread 1/2 cup filling on overlapping egg sheets, leaving about a 1/2-inch border on each long side. Fold in border of long side nearest you and tightly roll up sheets jelly-roll fashion into one 11-inch-long roll. Wrap egg sheet roll in plastic wrap and chill 1 hour, or until firm. Make 3 more egg sheet rolls with remaining egg sheets and filling in same manner. Egg sheet rolls may be made 1 day ahead and chilled, wrapped well. Discard plastic wrap and trim ends of egg sheet rolls. Cut rolls crosswise into 3/4-inch pieces. Arrange pieces, cut ends up, on a platter and top each with about 1/4 teaspoon caviar.