Iâ€™m not usually a mid-century type of girl, but Iâ€™m totally smitten by these vintage school science charts. Etsy seller Scottie in a Canoe has several available including my personal fave â€” gravity. Posters are 12.5 x 15.5â€ and just $20. You can find more vintage school art on Etsy by seplaceing for â€œschool postersâ€ under the vintage category. â€” Sarah L.