Completion day. Framed for the first wall.

For most buyers it is completion day: the afternoon the solicitor rang, the keys came over and the house was finally theirs. For renters and first-time movers it is often the first night, eating fish and chips on the floor among the boxes.

Use the new address as the place. We work out the point in the sky that was directly above the house at that hour and frame the catalogued galaxy nearest it, with the street or town, the date and up to sixty characters of your own words. It is the one picture in the house that could only hang in that house.

• 14 Elm Grove · keys at 2.40 pm · welcome home
• Our first night here. Boxes everywhere. Happiest we've been.
• For Sam & Priya, from everyone who carried a box.

Not sure of the hour? Use the time on the completion email, or simply the evening. Any time you choose gives a real galaxy that was overhead then.

New homes have empty walls, which is the one moment a larger piece is easy to place: 24 × 30 in above a sofa or 32 × 40 in in a hallway or on a stair wall. If you are not sure of their taste, a gift voucher lets them choose the date and the size themselves.