Celtics’ Gerald Wallace settles into another rebuild

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Jeff Green was surrounded by green basketballs to sign at the Celtics’ Media Day at the team’s facility in Waltham.

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First-round draft pick Kelly Olynyk smiled while doing a radio interview. Players posed for photos, did promos, and answered questions from reporters.

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Gerald Wallace listened to instructions while doing a promotional video.

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Head coach Brad Stevens filmed a promotional video during which he was told to try to appear as if he was stressed on the sidelines.

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Jared Sullinger had a laugh during a television shot.

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Team president Danny Ainge was at the event.